Here are some useful links from around the web about Hapkido:
Wikipedia Page: http://en.wikipedia.org/wiki/Hapkido
Hapkido Information: http://www.hapkido-info.net/html/hapkido_home_com.html
World Hapkido Association: http://www.worldhapkido.com/
Think there should be a link here that we haven't mentioned? Email us at firstname.lastname@example.org and we'll put it up if we like it!