Paul Thurrott really unloads on Vista RC1's user interface. Reading the article, he has a LOT of very good points. There are some places where it's just plain nonsense and no amount of talking is going to make a selling point out of it.
The point is made that the new interface is going to require a lot of retraining, particularly for users who are visually challenged. That is not good unless there is a real reason for it, like an improvement in function. Unfortunately, that does not seem to be the case.