I just discovered an even more obvious and easy to automate way. Pick random words, like "newyork", and MD5 them. Then search for them on Google (or elsewhere),

I just discovered an even more obvious and easy to automate way. Pick random words, like "newyork", and MD5 them. Then search for them on Google (or elsewhere), adding a whitespace and then "@gmail.com" or "@hotmail.com" or whatever. It'll show a list of accounts who have used "newyork" as their password with a web-service once, and possibly their e-mail account as well. as a programmer, all logic and simple. but it still is really scary.