Caro has also put out a series of video CD's on tells. There are approx 5 cd's, and are available pretty cheaply, I think I spent around $20 for the bunch. They are helpful, because you can actually see the tell he's addressing, which in my case helps me identify it later. I agree with many of the responses here tho, tells are probably more useful to the expert player, where as betting patterns are more useful to beginners and intermediate players. Good luck.