I spent hours upon hours as a kid building domino creations. I finally made got my chance to develop the my dream iPhone app "Domino Domino"

You should check out this YouTube video:
http://www.youtube.com/watch?v=z4TFGHlbeJw

You can get the iPhone app "Domino Domino" on at itunes at:

http://www.itunes.com/apps/dominodomino

If you like building domino runs you should check it out.

Thanks,
Steve