Going to take a moment and recommend people keep up with their computer security...and not use computers they aren't sure are safe; I really recommend picking up one of Blizzard's Authenticators.
I bring this up because I was recently hacked; I let a friend who isn't as picky about what sites he visits use my account to try out some different classes at level eighty and BAM, a week later I'm hurting. An authenticator would have saved me a lot of headache; despite what you may here, it's all but impossible to hack an account using one.
Anyway, just wanted to share that in the hope that maybe serve as an object lesson for someone else. :)