I'm probably a bit late replying for the OP, but I've been using a adjustable windshield mount and an adhesive dashboard disk.  It's been successful and stable for a couple of months now. 

The mount: http://www.amazon.com/gp/product/B004M8ST36/ref=wms_ohs_product?ie=UTF8&psc=1
The dash  adapter:  http://www.amazon.com/AP013-Adapter-Circular-Adhesive-Console/dp/B001IB2120/ref=sr_1_4?s=automotive&ie=UTF8&qid=1369249561&sr=1-4&keywords=dashboard+disk

I'm testing Animated Weather Clock.  It looks good, but I want to see if my battery life drops with it installed.  I've also used 3D flip clock and weather, but the weather screen is s bit limited.   Animated Weather has a slider so you can see how the weather will change.  I 3D weather only shows the current forecast.

Just wondering how long other's Nexus 7 takes to fully charge?

Mine charge time seems unreasonably long.  It was at 35% when I plugged in into my PC, after 4 hours of not using it, it's at 66%.  Battery drain isn't bad, sometime it's worse than others depending on what apps - like live wallpapers, I've got installed.   But at this rate it will take 12 hours to charge.    I'm not sure it's always this bad, but it does take several hours every time.

Just curious, is this common?  Is there something I can do to speed it up?

Thanks

Several hours later I did receive a string of old texts.  It must have taken a while to sync.  It is still too slow to be useful, so I I'm giving Talkatone a try.
Thanks

I'm sure you're right about apps not going to sleep; but are they designed to?  SMS, Weather, Email etc, apps poll regularly for new messages or alerts.   Weather Channel is always one of the top battery draining apps on my N7, and I seldom use it.   I'm not sure if there is anyway to prevent installed apps from actively updating\polling; but I haven't made finding it a priority.

I use it as my primary music player - except when I'm hiking or working out, then I go back to my Clip+.  I sprung for Winamp pro, so I can wirelessly sync music to the device from my desktop for times wifi is unavailable.  I have several internet feeds, Last FM, Songza, Pandora, Google Play and Plex, Orb and Skifta to access media from my PC.    I have all that on my phone as well, but I never use it, because I've been caught with a low, or dead, battery too many times when I need to make a call.

I also like the big screen.  My tired old eyes can read it!  I need to get some Bluetooth speakers now.

I think tablets can, and will replace PC\Macs for most things.  Remember the 3270 terminals from the mainframe days?  It was nothing but a monitor with a key board.  Where I work, we have to use Citrix to access all our enterprise apps, even for development.  That effectively reduces my PC to a 3270 with a web browser.  There are a few guys here with company issued iPads.  They run citrix and have the same access that I have.  Add a doc with a keyboard, and they pretty much have a laptop. 

I think it would be great to have a single "server" computer in my home and then everyone has a tablet as personal terminal.  As the OP stated, we would need more customization and security options.

1-2 hours on a "typical" day.

Sometimes I'll use it more, but seldom over 3 hours a day.  I still use my Kindle a lot for reading, and my Sansa Clip, PC or Stereo for music much of the time.  I do use the Nexus for that and much more when I'm out and about.