The Diablo 3 beta has officially begun, and Blizzard has sent out the first wave of beta keys to some lucky participants. If you opted in to Blizzard’s beta testing program (which is required to qualify for a key) then you can go check your inbox for a key.
If digging through your inbox doesn’t sound like fun, an even safer way to check for your invite is to log into your battle.net account and see if the Diablo 3 Beta shows up under your list of games.
A word of caution. Blizzard has not yet sent out any promotional beta codes so any site or email claiming to be giving away codes is a fake. In general, any site that requires you to complete an action like a survey is just a scam, and right now that extends to any site claiming to be giving away codes at all. The only way you can get into the beta right now is for Blizzard to activate the game in your battle.net account.
If you didn’t get an invite, don’t jump off a virtual cliff just yet as the invites to the beta have only just begun. Blizzard will soon be giving away promotional keys to sites like this one to use in contests, and there will be additional people added to the beta by Blizzard over time. Beta invites have only just begun.