If you failed in getting tickets for this year's BlizzCon event (21-22 October), Blizzard will bring you all the action and announcements from the show on the recently opened Community Site.
BlizzCon will play host to two Starcraft II tournaments, Global Battle.Net Invitational and the finals of the coming season of GSL. Both of these events will be stream on the site.
Hopefully BlizzCon will also bring us some news regarding the Diablo III release, and perhaps new information on the next chapter of Starcraft II.