check out the blackberry 101 how to free up memory. it will show you how to delete vad and push to talk as well as some other things to free up memory.
You should be able to go to options-advanced-applications-delete. I'm not sure how complete this is - or if Pete6's memmaker program does a better job, but I've deleted BB programs this way and made room.
Posted from my CrackBerry at wapforums.crackberry.com