From the teams I've seen play...
Canada has Scott Niedermayer, Martin Brodeur, Jay Bouwmeester, Eric Brewer, and Vinnie Lecavalier who all stand out to me. Niedermayer has played very physical and Bouwmeester/Brewer have both been much better than anticipated. Lecavalier has continued his playoff tear and that tells me Tampa is going to continue to be dangerous. Broduer has been, well, Brodeur.
U.S.A. had a few players such as Paul Martin, Robert Esche, Steve Konowalchuk, and Scott Gomez. Martin has been much better than I dreamed he could be and Esche proved to me that he is no fluke goaltender like Philly is used to getting. Konowalchuk and his linemates all played solid adding physicalilty and some offense, though no scoring. Scott Gomez is the real standout - he's the future of USA hockey.
Russian defenseman Oleg Tverdovsky, despite Thorne's butchering of his last name, was quite good. Frolov had some good chances but failed to finish when necessary. Alexei Yashin was the real standout, he played some of the best hockey I've seen from him in recent memory.
Finland's goaltender Miikka Kiprusoff, nothing else needs to be said about him. Koivu and Selanne were both pretty good but Eloranta is, in my mind, the most impressive player on the Finnish team, perhaps because I wasn't expecting anything from him.
Czech Republic had Patrik Elias and Martin Havlat. Both were fantastic through the tournament. Hell, the only players on the Czech team who really stood out were Malik and Sykora, and that's because they were awful. Once past the first two games every player on that team played to potential, but Jagr isn't nearly as strong as he used to be.
Slovakia was downright awful all over the board. Really had no good standout players. Chara was surprisingly bad defensively while Hossa and Satan were totally invisible. Gaborik was the only spot on the team which even had a dim light and he couldn't finish.
Sweden and Germany I didn't see enough of to judge.