That’s right, it is a free 33 lesson introduction to Photoshop on YouTube by TastyTuts. There is a 12 minute introduction (yes, you should watch it), followed by the 33 lessons. Go here for the full video list. More at the links below.
Video Links
Learn Adobe Photoshop – 33 episode course
Photoshop, Lightroom, and Elements Books
The Best Basic Introductions to Elements, Photoshop, and Lightroom
Lightroom & Photoshop: The Essential Books
The “Mastering Photoshop†Series