The Diablo 3 beta servers, running on and off for testing since last September, are coming down for good on May 1. At that point, all of the characters currently in the game will disappear forever. You'll be able to being the full quest anew when when Diablo 3 launches on May 15.

The forums for the game are also being locked down. To post there after May 1, you'll need to either have pre-purchased Diablo 3, or have an active StarCraft 2 or World of Warcraft account. So, if you have complaints about Diablo 3 but don't meet that criteria, you'll have to go, oh, you know, anywhere else on the internet.