I'm using the Adobe Flash CS4 Classroom in a Book to learn Flash CS4 from scratch. The lessons are very good and very helpful, but I gave it a 4 / 5 because it is riddled with errors that should have been caught during editing. I don't mean proofreading errors, but rather substantive errors that a copy editor who is reading for understanding should be able to catch. It sometimes makes things a bit more confusing, but I've been able to understand what was meant, so not a big problem.
I like that the lessons are all explained through very helpful full color screenshots, so as a guide, I do recommend this book very much, but just hope that in the future Adobe works harder on the editing aspect of their text publishing.