The Rockies will be playing simultaneously against the Diamondbacks and White Sox this afternoon. The Arizona game will be broadcast on MLB.TV, while the game at Hi Corbett versus the White Sox has no coverage as far as I'm aware, but you can probably follow along with MLB's GameDay via this link:
http://mlb.mlb.com/mlb/gameday/y2007/gd.html?2008_02_28_chamlb_colmlb_1&brand=mlb
and if you're not a subscriber to MLB.TV, you can follow along with the Arizona game here:
http://mlb.mlb.com/mlb/gameday/y2007/gd.html?2008_02_28_colmlb_arimlb_1&brand=mlb
Aaron Cook, Victor Zambrano and Brian Fuentes are scheduled to pitch against the Sox, Kip Wells and Manny Corpas will be in the Arizona game.
Go Rockies!