Someone's put out a series of Photoshop tutorials (training) - with a twist. It's basically half comedy and half training. There are currently five of them - they are advanced enough that even I've learned things from them.
Rumor has it that the guy doing the voice-overs is comedian Dane Cook.
The series called You Suck at Photoshop, and it's definitely NSFW (not safe for work) - don't click if you are easily offended!