I don't have a running background so many points the book makes may have already been obvious to experienced runners. As with every running book I have read, Chi Running teaches you to prevent heel-striking. I started to learn this last year before I read the Chi Running book. It took some time to get used to but it is probably the single most productive change in a novice runner's form. Chi Running builts on this by emphasizing the lean, swinging your legs to the back and using hip flexors and "core" muscles to extend your stride without heel striking. There is a lot more to it but I find that this method helps spare your quads and calves--this is especially useful after you have wiped out your legs on the bike. As far as how to learn this, I find that making a short (<10) list of items from the book is step one. Then on your runs, just pick a few items to follow. After a while, you should start to feel what is most efficient for you. Of course, running with someone who is set on following the same method always helps.
Has anyone purchased the DVD? I haven't heard anything good or bad about it but would like to know if it is worth the time.