Avoid task killers for Android. They do more harm than good.

I use Memory Booster but there's a few questions to ask yourself before killing any app.

Does the app need to save?
Does the app do anything in the background?
Is the app needed by your device to function correctly?

If the answer to any of these is yes then killing them apps may give you a hard time.

Note that android trys to deal with paused apps the best it can and when an app is closed by normal means it runs extra commands before it signs off, it is the lack of these commands that can cause undesired results when killing

Hope this helps.

Alright i wouldnt worry about killing apps to much cause over all it does a really good job at clearing up ROM on its own but if your really need to stop somthing follow this:
1)settings
2)Applications
3)goto "running"
4)click what u want to kill and hit force close

Android has built in memory management for apps. Only kill an app if its unresponsive.

What you are looking for is called , backrounder
I got it on my phone n it works awsome. I think it might be a widget .not positive though.

Dont use them they are not worth it. Use advanced task killer that android provides for you in the widgets section

Be careful I use kill app and messed my phone right up had to take it back and get a new one