This guy is really good at building things with dominos!
Here are my favourites:
http://ca.youtube.com/watch?v=z6mLPURj3_k
http://ca.youtube.com/watch?v=Rhl1Idcrtdg
http://ca.youtube.com/watch?v=SabqeYCsAkE
http://ca.youtube.com/watch?v=6k8qTmrDbYg
http://ca.youtube.com/watch?v=JqyX-6VOHjE