Something that most everyone missed in iPhone firmware 2.0.2 is that the ability to update all of your applications from the iPhone App Store is no longer available. The ability to update all is still there in iTunes on your computer but if you have multiple applications that need to be updated on your iPhone you have to do them one at a time.
I truly think that this is one of the huge culprits in terms of the bugginess of firmware 2.0. The applications are either having failed installs or partial installs and therefore crashing when you try to load them. this is all but confirmation from Apple itself in that regard.
Apple is deffinitely trying to fix these issues as fast as they can and although all the bugs aren’t quite worked out yet this is a significant step towards fixing the problems.