ArkSwitch is an easy to use task manager specifically for WM6.5.x.

Changes:

– FIX: Double tmail.exe (and others) listing in certain situations
– CHG: Reverted back to X button instead of OK button for the main ArkSwitch screen
– ADD: Memory usage percentage
– ADD: Experimental memory usage efficiency index on the App Info page

http://forum.xda-developers.com/showthread.php?t=618300