So, ESPN doesn't have a Playoff Pick'Em game (since there's only 11 games in the playoffs), but they do have this sort of interesting salary cap game based on the playoffs. The game is free to play.
http://games.espn.go.com/nflpc/frontpage
Basically, you have a salary cap of 50 points, you pick a roster of two QB, two RB, two WR, a TE, a K and a team Defense that adds up to 50. You get all the points those players accumulate in the playoffs. So an important part of picking players is deciding how many games they're going to have the opportunity to score points in. You can't switch once the playoffs start, so you're stuck with who you've got, even if they lose in the first game of the playoffs. 50 points won't buy you every player you want, so you kind of have to pick and choose a little bit.
EDIT: It appears you can change your lineup every week up until the conference championships. So Brady & Manning aren't going to do you much good this week, but they would be great next week. And you can probably get them for cheap this week, as I would imagine their price would go up once they're actually playing games. I guess it should be stressed to read the rules so you understand how the game works, it's a little more complicated than I initially thought.
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Past champions of BG forum events:
2006 Bowl Pick Em: Makaveli
2006 BG Fantasy Football: Thuggy
2007 March Madness: Byrd
2007 College Football Pick Em: Ryany
2007 Bowl Pick Em: Akiyama