I just wanted to post on here about a new forum called a wikipage that was created by horse behavior researchers. This is a website you can join, I think for free, and be able to upload videos of you riding. Those on this forum will then be able to critique, not the riding, but the attitude of the horse and help you to create a happy more willing partner. Of course this will in turn improve your riding I'm sure! On one page there are loads of videos posted with ridden horse body language to help you learn more about what our silent friends are telling us. Check it out!
Also there is a blog that will post updates and some interesting articles on horse behavior. These both should be great resources for riders with a wealth of knowledge!!