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Hey man, be serious, Dock is nice looking if do not use it, but it is terrible if you are out of lucky to use it.
Expose... to tell the truth at least 90 of MacOSX users do not even use it (there is a huge Apple stuff on my working place, this is an academic institution tradition, and is disappearing slowly). On the other hand, the 3D switcher in Vista is really cool. I noted in one of the previous posts, that actually the API of this feature could be amazing to apply to multipage documents enabling looking through the pages as you do with hardcopy stuff and I think it is very useful.