Lately, I have begun to see some buzz related to the various ROMs offered for our beloved Nexus 7.  Strewn through this forum, and others, I have seen various lists of the ROMs currently available for the device.  I felt that since each list has some minor differences, I would try and compile all of the ROMs I could find, along with a quick synopsis of each one.  As time goes on, I will flash each one on my device, and post some of the notable findings/bugs.  Please, if I have missed any, send me a PM, and I will add it to the list.  I will be obtaining the information from the various forums I am part of, and other repositories, and will try and note them all at the end.  Also, as the list is going to be sizable, if a new version of the ROM comes out, and I miss it, please send me a PM, and I will update the link. 
Thanks, and happy flashing!
•   CodenameSammy 1.2
o   This ROM is based on Samsung’s Touchwiz platform, and comes with all of the various UI enhacements offered by Samsung.
o   Includes the following apps:
   GApps
   Pop up Play
   MX Player
   Flash Player
   Playboard
   ROM Manager
   Smart Rotate
•   TeamHorizon XenonHD vXV (JRO03R)
o   Apex Launcher
DSPManager (JB) added with all the binaries.
Apollo Music player added and fixed for JB.
Proper extended power menu.
180 degree rotation enabled.
Navigation bar button pressing speed quickened. (Galaxy Nexus only)
Scrolling cache improvements.
Support for caller display name.
Developer settings as shortcut option.
Digital clock widget added.
Added XenonHD wallpapers.
Louder output on speaker for Maguro and Toro.
Added Galaxy4, PhaseBeam and Holo spiral wallapers.
Wi-fi scan time to 100 to save battery.
Performance, battery life and other misc tweaks.
Init.d support with added tweaks and scripts.
SuperSU application for root.
GPS and Camera fixed.
Reflective soft keys.
Build.prop tweaks.
Battery life tweaks.
•   SmoothROM v3.1 (JRO03R)
o   Liquid Smooth ROM
o   Lockscreen Mods - Slider, Rotary, Sense, Lense, Ring, Circle, Honey, and Halo.
o   Lockscreen shortcuts for phone, messaging, and other apps
Lockscreen shortcuts for Phone, Messaging and other Apps
o   Different battery types
o   Reboot menu
o   Configurable text colors
o   DSP Manager
o   Titanium Backup
o   Superuser v3.05 and different binary
o   GApps
o   Liquid Toolbox Settings
o   LED Notification
o   Overclocking Menu
•   Cookies&Cream 1.1.0
o   This is the ROM I currently use, and have been using for some time.  Thus far, this is my favorite ROM
o   Based on AOSP
o   Awesome Boot Animation
o   Once trebucket was fixed, this has been problem free.
•   TEAM SHOGUN AOKP Builds V4 (4.1.1)
o   Another AOSP build
o   Root & Busybox
o   SuperSU
o   Bash Shell
o   Unsecured Boot.img
o   Trinity Kernel
o   Ad Blocking
o   ROattion Toggle
o   Power Toggle
o   OTA Support
o   User Management

•   BAKED Grouper Blackbean #5 (4.1.1)
o   AOSP Base
o   Includes Aokp Toggles
o   Includes Powerwidgets
o   8 Lockscreen shortcuts
o   Lockscreen weather
o   Lockscreen calendar
o   customized MMS App
o   DSPManager
o   System apps and Gapps inverted
•   CM10 kang alpha (4.1.1)
o   TEAM SHOGUN MIUI JB 1.6.1 (4.1.1)
o   Based on latest MIUI & JB Frameworks
o   Deodexed
o   Zipaligned
o   Busybox
o   init.d support & scripts
o   faux123 Mainline Kernel v11
o   DPI set to 240
o   3 Way Reboot-Menu Mod
o   No Carrier ID
o   Some Google Apps
o   English language default
o   USA set as default country
o   MIUI US Weather
o   No default MIUI recovery
o   Full MIUI theme support
o   Full browser flash support
o   Google Now
o   Nova Launcher
•   Official AOKP JB Build4
o   Custom Navbar
o   Custom ICS Based Navbar
o   Customizable Lockscreen Ring
o   Alternate default app picker
o   Menu UI Overflow Toggle
o   Option to disable vibration for Notification expansion
o   RAM Bar in the Recents panel
o   Timeout and instant lock options for Slide lock
o   Different icons
•   Bugless Beast (AOSP)(4.1.1)
o   Based on AOSP firmware, which provides stability, and a similar feel to stock.
o   Includes core Google Apps
o   Google Wallet is included

•   Kaos Droid v3.7.3
o   Android 4.1.2 - Based on CM10 JZO54K AOSP
o   Stock Kernel
o   Motley Kernel
o   Faux Kernel
o   Aroma Kernel
o   Optional Flash Player
o   Optional AOSP
o   Landscape Support
o   SU Binary an SuperSU
o   Busybox
o   Lower Nav Bar

•   Codename Android 3.6.0 (JRO03R)
o   Based off of Clean Android 4.1.1 Rev6 (JRO03R)
o   Included File Manager
o   T-Mobile Theme
o   Trebuchet Launcher
o   Volume buttons move the cursor while typing
o   Custom Camera App
o   Customizable Messaging app
o   SMS Templates offered
o   CM Customized Phone app
o   Customizable Status Bar
o   Custom Notification Bar

•   CleanROM 1.2.5 (JRO03D)
o   Aroma Installer
o   Custom O/C kernel with GPU OC by _Motley! - Stock kernel is HERE if desired!
o   Optional Tablet Mode Mod by barrmulio (Experimental!)
o   Nova Launcher or Stock Launcher!
o   Standard Battery or Battery with Percent
o   Advanced Reboot Menu!
o   Tweaks for battery and performance!
o   init.d Support!
o   Zip Align on boot!
o   De-odexed!
•   Kyorarom Serenity (CM10)
o   Rooted
o   CM10 built from source code
o   Serenity Kernel
o   Overclock GPU to 480MHz
o   Tablet UI (switchable) (thanks to SGT7)
o   720p Video Recording
•   MCR Jr7 (JRO03D)
o   Based on the 4.1.1 / JRO03D release
o   Tweaked size of bottom navigation bar to make it consistent with the rest of the UI - big improvement!
o   Option to move to the right hand side of the device in landscape mode
o   Added initial support for contact sync via the Facebook app. Further enhancements to follow, but basically functionality should now be working
o   Flash player with stock Jelly Bean browser included. Optional BBC iPlayer
o   YouTube that allows preloading
o   Multiple button configurations (stock or dual 'active when hidden')
o   'TweakDeck', improved and updated Tweetdeck
o   All Google components are running the latest
o   SuperSU from ChainfireXDA
o   SQLite performance patch
o   Not odexed
o   Insecure boot image
o   Camera Launcher
o   Disabled Jelly Bean 'disable apps on boot' feature
o   LatinIME with forced Phone layout
o   Launcher with rotate support
o   Nova Launcher as default launcher
o   Apex Launcher a secondary option
o   Alternative appstores (Amazon, GetJar patched for maximum compatability and SlideMe Market)
o   Our own 'OdexMe' on-demand odex application
o   Enhanced Power Menu by djmcnz (updated for JB)
o   ClockworkMod ROM Manager
o   Disabled menu key unlock
o   Titanium Backup
o   Disable camera shutter sound
•   MIUI-2.8.17 v0.1 Alpha (4.1.1)
o   This is an alpha right now, and has history coming over in Chinese.  I am going to wait to look at this one until it comes to beta.
•   EUROSKANK Jellybro (4.1.1)
o   This build is primarily a Cyanogenmod 10 kang.
o   Virtually a CM10 nightly build
•   AOKP Nightly (4.1.1)
o   AOKP Project
o   Includes all AOKP updates
o   Themes
o   Dev is extremely helpful
•   prerooted STOCK JRO03D
o   Android OS, 4.1.1 Jellybean build JRO03D
o   Insecure boot.img
o   Rooted with the latest superuser
o   Busybox
o   Deodexed and Odexed options
o   Fully Zipaligned
o   Flash from Custom Recovery
•   Glazed JellyBean Version 1.1.2 (4.1.1)
o   Android 4.1.2
o   Beats Audio
o   XLOUD
o   Sony Bravia Engine
o   Odexed
o   Franco Kernel
o   Ad Blocking
o   Flash Enabled
o   Theme Manager
o   Camera App
o   Weather widget*Beats Audio

Welcome to the forum DaxFX!

Safe mode on the phone is similar to that on a computer.  Basically, it opens an app free image of your device.  This gives you a free slate to add your apps, one by one, and find a troublesome app.  The cool thing is your not wiping your device, so when you get out of Safe Mode, your device is as you left it.

K if for Key Lime Pie, Android 5.0

Mavrickman360 is accurate.  I don't think you can go from the N7 to anything without the computer interface, to my knowledge.

It depends on how you look at it.  If you're referencing what we would traditionally think of as the Stooges, then it would be Larry.  That said, Ted Healy was the first to headline the group, and it started with Shemp, Moe, and Curly Joe, which were brothers.

I've had great luck with Battery Defender as well.  I love the fact that it give me the ability to mess with the settings, thus giving me the flexibility to tweak until I get it the way I like.

As far as whether or not it is worth buying the ultimate or other paid versions, I myself, have the Ultimate, and it gives me some more bells and whistles, but IMHO, I mainly bought the app just to show support.  I suppose, in a nutshell, it may be worth the couple of dollars, but it really isn't a deal breaker, as the free version works very well.  I am simply the type of guy who likes buying the donate version to show support for quality apps.  There's so much trash out there, when I encounter something worthy, I show some gratitude.

You're half right Prime, it was Curly who "resembled" the remark, but there were six Stooges in total.
Moe
Larry
Curly
Shemp
Joe Besser
Curly Joe

The last three being complete crap.  I've attached the Three Stooges website for all of us to enjoy.  I have based a majority of my adult life on some of the teaches of these guys.  Nuk, nuk, nuk.....

http://www.threestooges.com