Best Android App? App Cache Cleaner - FREE!!! May fix errors and feel more responsive. set to auto clear
Only just discovered this today...
Clears application cache = much better than App Killer... run and it and see... install as widget for one click clear... may help smaller internal memory phones - helped mine! Huawei Blaze
Go to Android Marketplace and search and install. very small file
Other other useful free apps ? Please post!