Between myself and my family we've used a number of different Android phones and we've used Advanced Task Killer on each and every one. ATK helps you close any apps running in the background which free up memory. The handy widget makes it even easier! It will display a notification on how many apps were closed and how much memory was freed up as well. If you're having battery issues ATK will help by closing apps that you may not have known were even running. With no easy way to close some of the more memory-intensive apps this is what you need to get them back under control.