Don't break the MD5 hash, just look it up.

This not about using rainbowtables. Kind of. Today an interesting article on Slashdot appeared: Using Google To Crack MD5 Passwords. I was a bit surprised to see yet another application (Wordpress) storing raw MD5 hashes in the user database without using salt.

In one of the comments, I found this interesting link: http://md5.rednoize.com/

Bonus: Google as an MD5 Cracker.. (Sensepost)