I have posted this before but I'll reiterate my opinion...
Firstly Android isn't like Windows, it doesn't need free RAM to start tasks or application because it will borrow the needed RAM from somewhere else. Android is very good at managing itself, more recent versions of Android have hugely improved on this in the last year or so.
People generally use TaskKillers because they believe they save battery, this is false. In actual fact they probably do more harm than good, think of it like this...
When it comes to those applications like Maps that start on their own, people usually set a TaskKiller to auto killer those applications. So the TaskKiller kills the app but Android restarts it, the TaskKiller kills it, Android restarts it, TaskKiller kills it, Android restarts it......and so on....and so on....
What do you think that does to your battery??
This is my take on the whole TaskKiller thing, I'll read your link once I've finished this post. If you want proof that this is my feelings on the whole TaskKiller thing, search the forum, I've posted similar before...