Blizzard's got a tough road ahead, though -- if they win, they're likely facing fan favorite Harmonix (heck, I love Harmonix), and then will probably show down against either Bioware or Rockstar, both extremely popular developers. The other side of the bracket will likely have heavyweights like Nintendo and Valve coming out of it, too, so it'll be a tough road if Blizzard wants to make it to the top.
To vote, you just have to head over to The Escapist's forums -- the next round starts tomorrow morning, and every few days they're moving the developers on to the next matchup. The final round will be decided on April 8th, and while of course winning means nothing at all, this is a nice chance to show off your developer pride. Say what you want about the recent class changes, but Blizzard has given you Starcraft, Diablo, and World of Warcraft -- how can you not vote for them?