I know many power users were having issues with the 3.0.7 version of the Funambol client that this new version is purported to fix. You can pick up the new version here:
http://funambol-bb.sourceforge.net/
If you have no idea what Funambol is then let me give a little bit of background. Funambol is a SyncML”ish” opensource server that allows you to synchronize your information from your mobile device to the server. The information synced is your calendar and such. You need to have a Funambol server for this application to work.
If you are still confused check out this Wikipedia article on Funambol. I can’t really explain it better without going into a full discourse. 
