To find out more about Yoga in general, the Yoga Journal website is a fabulous resource and worth browsing through.
Yoga is fantastic for surfers (and every other active sportsperson). The Yoga for Surfers range of DVDs will help you recover after a hard day, or whip you into shape on days off! Highly recommended - I practice all 3 DVDs regularly. You will love it even if you don't surf!
You can buy the DVDs from Amazon - links below: