The Today Show had a clip showing the top commercials for 2009. Even the PETA commercial (which has a message that isn't humorous) is done well and has a humorous bent to it. Humor is a great seller of products because we love to laugh. Check out the winners at:
http://today.msnbc.msn.com/id/26184891/vp/37589628#37589628 (oh, there is an ad before they show the winners so be patient 'cause that ad isn't funny).