I've always been fond of the the horrible animal crossing commercials. with the people with the giant plastic heads.
and the mercenaries commercials are hilarious.
blow it up. blow it up again. blow the living crap out of it. blow the living crap out of it again.
then there are the rachet and clank commercials.
and the soccom comemrcials. team killing lol.
the metroid prime comemrcial was good.
The Echoes one with actress playing Samus is not bad, remember, when the pieces of armour just flow out from nowhere and adhere to her. That is pretty good.
http://www.gametrailers.com/gamepage.php?id=9
Click on TV Spot 1.
Oh my fav, is a radio commercial for The Ultimate Doom, you can downlaod it here as mp3, it owns!