I've always used the "... Classroom in a Book" books. They're the "official" training workbooks from Adobe Systems. Whenever an upgrade comes out for any of my Adobe apps, the company gets me the books to help me get up to speed on whatever the changes are...

granted a lot of the times it's not that necessary to get another book, for every upgrade but i've found those books have been the ones i go back to, or train others from...