I honestly don’t think I can facepalm hard enough for this amount of fail from Blizzard. This is from their forums:

Nitrinea: I am able to log into D3 even if I change the case on some of the letters in my password. This should be fixed.

Vasadan(Blizzard Rep:Blue Post): This is actually consistent with all of our Blizzard games. Try it in WoW and SC2

I’ll be amazed if someone doesn’t sue them over this. And the news is getting out all over. I’m not currently playing ANY Blizzard games and I still ran across this just looking around my usual haunts on the intertubes.