Are you planning on tethering your phone to a laptop? I know verizon, att and a couple others have espn mobile tv capability, although I'm not totally sure how well they work. Sites like justin.tv are flash format, and unless you've got a beta of the android flash plugin, you're out of luck.
EDIT: If I'm wrong about channelsurfing and others working on your phone...let me know, it would likely be enough for me to seriously think about switching carriers.