Here are some useful links. I will be adding to these over time so please check back again:

• American Academy of Equine Art -
  www.aaea.net
  
• Society of Equestrian Artists -
  www.equestrianartists.co.uk
  
• Griffin Place -
  www.griffinplace.com
  
• Obsidian Art -
  www.obsidianart.co.uk