and here are some videos that i found useful
difference between the Cuban triple cap vs. traditional dominican cap
http://www.youtube.com/watch?v=dXvKIBt3Rs4
Accordion bunching
http://www.youtube.com/watch?v=Tjm8NV2wL-0
Entubado Bunching
http://www.youtube.com/watch?v=OHE6gGxtUy8
Sam Leccia rolling a nub, shows the use of a stainless work area. also shows the direction and shape to roll in.
http://www.youtube.com/watch?v=P43CGdp_RL4
Those are a some good basic videos i have used to help with construction.