Titanium Backup Pro

Hey guys, now I'll share an application. It's Titanium Backup Pro. I think this is an important application especially after your phone rooted. This application can backup your data, such as games data, games saves file and the other, so you won't lost it if you do something dangerous like upgrade your phone or use custom rom.  You can download it from market for about $3, but here you can get it free :D
You can download it here

Note:
You must root your phone to use this