Here's some nice knot videos.

Your line is only as good as your knots!

North American Fisherman Magazine - Video & Podcasts

Fishing Knots

Hey thanks for sharing these guys. I especially liked the videos from North American Fisherman - its nice to get good emperical data rather than just opinions.

Here is one that helps me more than a video, might be of some help?

Grog's Fishing Knots Index