Weijers Domino Productions - Undoubtedly the best in the business. Every year this Dutch-based company organizes Domino Day, in which dozens of builders spend weeks setting up millions of dominoes using the most creative designs and props imaginable. They own the current world record of more than four million toppled dominoes.

Tim Fort - A kinetic artist who creates elaborate gadgets using a wide variety of chain-reaction techniques of his own invention. He goes beyond mere domino toppling, and finds ways of using hundreds of popsicle sticks that will leave you dumbfounded!

Robert Speca - A former world record holder who has made several television appearances. He has published a book that teaches you how to become a domino toppler, and contributed his expertise for the music video "An Honest Mistake" by The Bravery.

YouTube Dominoes Group - Lots of videos by some talented YouTube users. The group is owned by someone nicknamed FlippyCat, who is quite good with dominoes as well. There's also a Discussion Board where members can ask questions and share ideas.

The International World Record Breakers' Club - Contains a nice timeline of domino toppling achievements. It shows how the hobby has rapidly grown over the years.

Do you like to build domino courses too? Let me know so I can add your name here!