Download manager. Improved app manager and IM. Fixed HotMail sync issues. Better global roaming. General stability improved. Of course it would have been nice to get Skype or Google Talk video chat with 2.3.4. But, hey, I didn't really want to use the front facing camera anyway!
Could be a long wait while VZW rolls out updates for the other handsets. There's a website for VZW corporate executives. I'll post it if I can find it. These are the people we need to contact if we want VZW to step up support for video chat and other features.