Here are some how-to clips on threes. I haven't watched them through so I can't vouch for their quality.

http://www.youtube.com/watch?v=OY6-MAb1Wns
http://www.youtube.com/watch?v=9ExY1gLQBHY

On hockey skates (he calls them "inside" or "outside" based on the backward edge he ends up on, figure skaters name them by the entry edge):
http://www.youtube.com/watch?v=LV0ko8N3Lno