Everything used to sync fine as of last night. Today contacts, tasks and memos decided to stop syncing wirelessly with my company's BES. Any ideas??

I have a Verizon 8830.

Make sure wireless sychronization is set to YES on all of 'em. If they are already set, then possibly your service book might be corrupted. Try removing all Desktop[ ] service books under Options -> Advanced Options -> Service Book. Then have your BES admin. resend the service book down to your device.