GirlGoneGeek says: Rooting your phone isn't for everyone. And, DISCLAIMER, it can void your warranty. But if you like to do a little hacking and you don't mind getting into your phone's innards, you should try out these apps once you get your phone rooted. Just be careful when doing system updates - you may lose root access and if you do, you lose your access to these apps.
Drad
Check Refine Efficiency: http://refineandroid.doodlekit.com/
Fast, Simple utility:
- cache cleaner (root and non root(individually)), no sd card cache support;
- market history cleaner;
- task killer;
- start up manager (root and non root(no guarantee));
- task scheduling.
Also browser history cleaner.