Found this in a comment on another blog that I thought I would share - it's pretty funny. From the late, great comedian George Carlin.
Looks like 29ers are getting so popular that there are now quite a few YouTube videos:
Here is a custom build 29er. The soundtrack is a little goofy and watch for the still of the bike at the end. Not sure if it's the camera lens but the bike's head angle is way too slack for a 29er in my opinion!