The American Prospect has a good
roundup posted of Obama's top staffers, written by one of their interns. The summaries themselves are ok, but it's most valuable for the links to more in-depth press pieces on each. If he's elected, many of the folks on that list will end up in very high-ranking positions in an Obama administration.
If anyone knows of anything similar for McCain, send it my way. I find it harder to get motivated to read about his staff, but it's equally important at this point.