Others say...

"Handy Guide"
A great companion to the canon speedlight instruction book. It does not over the 580 EX II specifically, but there is plenty of information to give you the basics and then some if you are learning the Canon speedlight system for the first time.

"Canon flash - moderately helpful/studio oriented"
This video was moderately helpful to me. There seems to be a limited availability of instructional material out there on this product from what I was able to find so, some help is better than none. The video does focus on portait style photography. If you are interested in learning about how to shoot childrens parties, weddings or events, you will be disappointed in the very limited information on that subject. If you are interested in studio portraits and studio macro photography you will get some good information. This video left me wanting more specific instruction on the operation and application of the 580ex outside the studio setting. Overall, if you are willing to pay $20 for a few good nuggets, it's worth it.

"Good AV to understand how to use the Canon 580 EX flash unit"
This DVD is a good audio visual presentation to explain the settings and how to use the Canon 580EX flash unit effectively. Some people can better understand instructional material when presented as a audio/video presentation than to read a book. Tim Mantoani does a good job in presented basic inflormation about light quality first and then how to achieve the desired effects that go beyond the Canon manual and that makes the DVD worth viewing and owning. I would recommend this DVD to anyone struggling with how to effectively use the 580EX flash unit especially in the ETTL-II mode. You can achieve results like professional photographers who make the flash work as they intended.

"Good buy"
Very good content. Done in a studio, but applies to the outside world just the same. My only complaint is that it didn't play on my TV, just the computer, and I had to download a video codex pack to be able to do even that. I would like to relax in fromt of the TV to watch this at my leisure.
Watch it a few times to sort of soak it all in. Lots of great tips, much better themn just reading about how to do sometning.

"Fantastic!"
This is an absolute must-have for any owner of the 430ex or 580ex canon flash. It teaches you everything you need to know, in easy step by step examples. HIGHLY recomended!