For those interested I thought I would post some links to different schools of hapkido
Here is hapkido as practised by one direct student of Choi's. You have to watch a bit of the video to see the hapkido part. The fellow who put this video together does as a travel logue showing all the various school he has visited in Korea. All quite interesting.
Kim Yun Sang
International Hapkido Federation hapkido (a major style)
A school of hapkido which seems to me to be trying to ‘recreate' a daito-ryu type approach. I say recreate because having seen this teacher's teacher. I don't remember his hapkido looking like this. Still some interesting stuff:
Another one of the teacher that David posted: