One thing you should do right now is a reset if you have a curve, alt-rilght shift-delete. Also take a look at the number of applications you have on your device. Go ahead and delete the one you don't use very often. You should also follow a daily memory clearing routine, especially if you are running one of the beta OS's. This would be something like clearing your logs and cache alomg with a daily reset. Some people like to do a battery pull, but a reset will work well also.
Posted from my CrackBerry at wapforums.crackberry.com