This is something that I find amazingly useful, the password checker. It uses simple math formulas, and has easy colors to show you just how horrible, or good your passwords are. I use this very often as being the paranoid person I am, I change my Google account password once every 4 months, and all other main passwords once a year.
Check it out, my current passwords get 64%, and 0% (for my throwaway one), and 70%. However, by adding an ! point to all of them the score rockets up.