Oh thats nothing, Read these two books and you could find anything.
Google Hacking
Yes, its a book, reading is good.
Extreme Exploits Is also a good one, Im 80% through that one.
Have fun with this one.
username password site:com filetype:xls
Type into google hit enter, helps if you have MS Excel and Im assuming your intelligent enough to realize what a treasure chest of information this search could bestow.
Just by changing the file type and key words you can find Billions of unprotected/unsecured files and personnel information floating around the net.
Google == pwnt
MUAHAHAHAHA.