Ruy Lopez, Steinitz Defense: Tarrasch's Trap

Ripper89

http://www.youtube.com/watch?v=ZQHctReqxXw&feature=related

Not really a trap but may be useful:

billwall

There are a few traps in the Steinitz Defense.  If Black is not careful, he can run into trouble.  In this game, White traps Black's Queen.