Ultra High Heels and fetish thingsHere you can discuss 7" heels, foot training/stretching, ballet boots, corsetry, wet and messy, worn shoes and related fetish interests.
Hmmm... This Google search should turn up some links of interest. I saw a warning about possible injury as a result of wearing pony boots, which may explain why they seem a bit more scarce than I can recall.
This whole "Human equine" fetish, both on its own and as a part of BDSM, appears to be quickly gaining in popularity. There are several sites devoted to the topic, complete with links pages: