This is an excellent article that provides some insight into some of the small added features of iPhone 2.1. For me personally, my phone seems snappier and more solid. Sounds aren’t randomly going away, contacts load as they should, location services seem to be working, apps aren’t crashing, etc. Overall, this is how the iPhone 2.0 release should have been. It took Apple entirely too long to deliver on this one, but, hey, at least it did it eventually, right?