Sure. Take a look at the National Arborist's Association's website at www.natlarb.com, then click on "Safety & Education." On the right, there's a navigation bar with "Videos" towards the bottom.
Additionally, surf to www.arbormaster.com and click on "Videos" for a whole lot of video cassettes to watch. These collections I've referred to are just the tip of the iceberg. My dad, for example, made a video series, but it is less climbing oriented. I'm sure others with post their favorite videos as well.
If you want the least expensive method, find a mentor who has been staying mentally active in the industry - someone who reads up on the latest developments and did stop learning 30 years ago like a number of elders in the industry have.
Finally, buy a book like the Tree Climber's Companion, 2nd edition, for $12 or so, and you'll have the ultimate reference guide to climbing. I'll fight that comment to the death. Maybe it's because I'm a vendor for it!
"The Fundamentals of General Tree Work" by Gerry Beranek, famous west coast arborist and logger. Lots of old photos showing old equipment and techniques, but much modern stuff too. Gerry goes into more detail than anyone. Highly recommended.