My god what I had to go through just to do this simple tutorial, I pulled my hair out, screamed and had a tantrum whilst doing this. Blender likes being crazy with physic's, I would set everything up and the domino's would fly in all sorts of directions. I had another problem with the domino's merging with each other but after searching through the forums I finally cracked it. Instead of using "Box" bounds I used "Convex Hull" and it worked! I love what you can do with it even if it can turn you crazy.

I've really nailed lighting and textures in Blender now, this means I can make animations look very realistic like the one I made here. The domino's started falling before the ball hit but that must of been some balancing issue but overall i'm happy with the way its turned out! it's 5am and im off to bed! oh yea I added some cheesey music just to make it less boring lol!