I don't recommend registering any of them as they'll almost certainly be revoked, I link only so you can laugh at the fail. That's right, they're all in eight text files.

http://forums.steampowered.com/forums/showthread.php?t=2098484


Witness the fail:

Met, I'm pretty sure you can get the link from your screeny; http://www.amd4u.com/dirt3promo/keys/ (?)
Also, in the steam link it says it's on a pastebin, so all you have to do is go to the site, view trending pastes and WAHBUM, nice try :3

The link is dead now so it doesn't matter.

I may have downloaded a few copies of the text files :3
Just so the memory doesn't die, y'know?