I have so many. I had to see what I actually used most in a day. 1. Tasker - Right now I have tasker turning off all my volumes during my sleep times during the week. Any of my favorite contacts will still ring the phone, otherwise not a peep. It will also text me the phone's location when I text the phone a certain set of numbers. Love Tasker. 2. SetCPU - Every good rooter should have this app. 3. Kindle - I read, what can I say 4. Angry Birds - I only need 2 more golden eggs. 5. VideoCam Free - I take a lot of video instead of pictures. This app opens the video recorder instead of the camera app. In interest of full disclosure, I wrote #5. I needed an app for that and couldnt find one. My $0.02 on task killers: generally not needed. However, if you own an older or lower end android phone knock yourself out. Just remember that it is an app and occupies memory like any other app.