Don't forget the apps developers had the 2.1 beta versions but they couldn't update their apps for release to the appstore on 2.1 until the final version came out this week ... so many 3rd party apps are crashing because of changes to 2.1
I'm assuing we'll see a flood up new versions in the coming week or so while will make everything more stable
Fixed most of the issues I was having but, annoyingly, introduced a pretty big one: Before the upgrade, syncing with BMW car kits was a bit "hit and miss" and apparently depended on the version of the iDrive software, etc, on the BMW.
I was one of the "lucky" ones, and my phone's contact list synced fine with my car. Unfortunately, after the 2.1 update the contact syncing to my car is now broken