Sign up for a free ten week Photoshop course at this site.
creativetechs has put together a 10 week Photoshop class at no charge.
The class is geared towards Mac computers and will be using CS4 (Adobe Creative Suite 4), though they mention that most of the class content also applies to earlier versions of Photoshop, as well as PC users. I couldn't find any reference to what earlier Photoshop versions will work.
Other than selling recordings of the class down the line for a small fee, if there's a catch, I can't find it.
The enrollment form has very few fields - name, email, where did you hear about the class, and what other classes you might be interested in.
I've never used Photoshop and I don't own a Mac - though I've been reading this blog a while, and if nothing else you can find some good tips and design information there.
Class starts the 26 of February, and covers Interface, Tools, and Shortcuts, Photoshop Layers, Selections, Advanced Selections, Masks, Pen Tool/Shape Layers, Drawing Tools/Brushes, Retouching, and Color Correction I and II.
They have a nice world time conversion at the site so class times are easy to figure out.
There are many more details at the site if you're interested.