Donnie Hoyle has created a series of unusual Photoshop tutorials: You Suck at Photoshop. I like them because of their offbeat, often inappropriate humor. There's not a whole lot of Photoshop instruction in them, but the presentation is certainly memorable.
I also like them because they are precisely the sort of instructional material that would never have been produced before the Internet. The effort and expense and risk involved in creating physical books is too large to risk it on an unconventional approach like this. Even the "Dummies" books were made possible by the rise of the Internet introducing the possibility of lowering your professional guard to deliver messages in a new way.