Not many casual fans know Yushin Okami, so the UFC has wisely put of all of its UFC 134 eggs in the Anderson Silva basket. The commercial currently running for UFC 134 is brilliant. Showing shots of an amazed and dazed crowd following Silva's front knockout of Vitor Belfort is a hit.
The only promo I've enjoyed as much or more was the video produced by a "mystery" source with Cain Velasquez and Co. poking fun at Brock Lesnar before their tilt at UFC 121 (NSFW). Understandably, this one never made it to television.