Mask & Channels - "Photoshop Channel Chops"

Can you please reccomend a book/dvd that deals in detail about mastering alpha channels and masks. Something like this book "Photoshop Channel Chops" but more upto date as this one is way old.
Thanks

Thats the only one that deals with the topic specifically, AFAIK. Good book, and the info in it is still relavant.

Way old doesn't mean it still doesn't work...if it ain't broke...