L'il beginnings Homepage - This is a great forum, you can also post minis for sale, meet other breeders, or find other great mini links.
Mini Horse World - Here is another min horse forum: it has games and polls and also a great rescource center.
USA Miniatures - This site is a good rescource. If has several great articles on purchasing minis, dwarfism, also links to the different registries.
Historical Miniatures - Here is a list of many of the historical miniatures there are. It isn't a complete list, but pretty thorough.
Equusite.com - Equuisite is a good source for training, plus there are photo contests and cool stuff like that
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Therapy Certification Requirements Guide - This is a list of things that I use as a guide for training my mini to be a therapy horse.
Mini Height Chart - Want to know what you're mini will probably mature to? Click here and find out.
Ozark Mountain Mini Tack - Need something strictly mini? This site is a source of mini supplies.
Nasco Farm and Ranch Catalog - This catalog is a great source of supplies, not only for horses, but for cows, sheep, pigs, chickens, goats, etc.
Animart Catalog - Animart is mainly a cow catalog, but there are some good supplies in here too. I use it for price checking and stuff like that.