If you haven't checked it out yet, check out the GDC coverage page. In fact, you oughta bookmark it, as it's gonna be updating pretty often until the GDC commences.
As you can see, I'm gonna be doing interviews and daily coverage of the show-floor. I'm getting together a reasonable laptop and digital camera setup that'll allow me to provide daily updates of the show-floor every night. My plan is to provide extensive updates of the expo floor every day, so you'll get to see what goes on almost as it happens.
I've also got some good interviews lined up. More to come!