The book is based on the lectures that I gave in October about Alpha Channel Basics, but it's expanded a bit, because I wasn't limited to an hour. :D
Inside, you'll find 36 pages of information explaining what an Alpha Channel is, why an RGBA image is 32 bits, how to make Alpha Channels in Adobe® Photoshop®, how to eliminate all trace of the dreaded "white halo", information about using .png instead, and when you might want to use .tga with a full alpha, instead of .png.
There are 40 colored images, and it was all laid out in Adobe® InDesign®, so it's like a real live book. Except, of course, you can have it in Second Life, where it's easy to refer to while you're working.
Come check it out! You can read it for free, and if you want to have a copy of your own to take away with you, it's only L$100. So you really can't lose!
Once again, you'll find it (along with the book about Making Gradients in Photoshop, and placing textures accurately Inside Hollow Prims) at the Texture Library.
See you there!