Cambridge in Colour Excellent tutorials, very well explained with great graphics.

Haynes Manual Very good Photoshop tips and techniques - click on 'digital photo know-how'.

DSLR TV Video tutorials on photography products and techniques.

How to Figure Friggin Focal Length and f Stop Thingies.
Good explanation, and pretty funny.

Ken Rockwell Great for general explanations. The 'How to make great pictures' is the section to look at.

Mark Johnson Very good series of nine video tutorials for Photoshop.

Photoanswers.com Photoshop tutorials and also on general photography techniques.

Photoshop Essentials General Photoshop tutorials.

Photoshop tutorials General Photoshop tutorials.

Strobist Great resource for lighting.

Tutorialiced.com Free Photoshop tutorials