the new york times has a great list of the top buzzwords of 2008. most of them come from the all-encompassing coverage of the election, of course. it will be interesting to see which fade in the months to come, and which become part of the lexicon of americanisms.
Really, they missed quite a few:
http://agitationist.com/101-web-business-cliches-that-must-die-in-2009