Here you should visit this site for a lot, Google Hacking Database (GHDB) in here > http://johnny.ihackstuff.com/index.php?module=prodreviews this will help you to search for warez, like a real warez d00dz =)
Here is some of my research on google:
lets use filetype:
ok, if you want to use some thing specific, try this
Check this site also for more file extensions (filetypes):
There is a lot what you can do with google just use your imagination, my friends!