I used Advanced Task Killer for a while but it started getting annoying that it wasn't showing simple applications running like Browser and such. So I searched around the market and found Task Manager. This sucker is legit and GOBS better than ATK. It has an ignore list...auto kill list...show/hide system apps. It is actually PRETTY :-D and on top of that it has a 1x1 widget thats pretty nice looking and will show you how much memory you have free... and on tap the widget will kill running programs that aren't in your ignore list. I will give this sucker 5 stars hands down! I am running this on Froyo 2.2 no problems.