Diablo III has now been released (finally), and unfortunately a lot of player were met with "Error 37" as they were about to start their adventures. Most players should be up an playing now, however, as Blizzard were forced to suspend Battle.net for a brief while as servers reached their maximum capacity.
"Please note that due to a high volume of traffic, login and character creation may be slower than normal. If you're unable to login to the game or create characters, please wait and try again."
More servers have been put on the job, and hopefully everyone will be able to enjoy hell from now on.