Tim,

A fun site for knots, some animated is Folsom knots

Another fishing knot site

These can be fun in addition to useful.

As far as the presentation goes I may use part of the time or follow up time to present a group excercise to see what the scouts thought would be needed--equipment wise and knowledge wise in a backpacking scenario where they may need to stay out longer than planned due to weather or some other unexpected cause. What skills learned prior to the trip would be good to practice, what basic equipment would be useful and what reactions to different events would be required to "survive" or thrive.

Interaction with the scouts would be my attempt to spark the interest and keep the discussion and thoughts going beyond the 1 hour presentation.

Good Luck, I am sure some of the Scout Masters will have loads of assistance for you.

Randy