The following links are always nice to take a look at, and as an added benefit they have a direct or indirect link to Natural Dressage.
www.youtube.com/user/NaturalDressage
The Art of Natural Dressage movies! At this moment we have movies on Chase the Tiger, the lateral movements, basic exercises with the cordeo and a movie on the Haute Ecole work. With Blacky in the courbette!
www.artofnaturaldressage.com
The Art of Natural Dressage forum naturally should be on this list as well: just read along or become a member and write with other Natural Dressage trainers!
www.vrijheidsdressuur.info
My old Dutch website, completely devoted to training tricks with the clicker. If you're able to read Dutch, you'll find a lot of texts that are also part of the book that I wrote on trick training: Vrijheidsdressuur.
www.equihof.be
The website and international webshop of Josepha Guillaume, co-founder of the AND forum. She has some wonderful baroque cordeo's in her collection!
www.equiplay.nl
A huge webshop with regular Natural Horsemanship tools, but also with very unique, light leadropes that are wonderful for working with the cordeo.