I just got hacked as well. My password was unique for D3, and I know what I'm doing, so my system is completely safe. There is no way anyone could have gotten my password off of my computer. Just no way. Because of the amounts of people being hacked, I think the issues may be server-side.
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And this:
http://www.eurogamer.net/articles/2012-05-21-diablo-3-accounts-hacked-gold-and-items-stolen