Not as many tutorials, but a great concise collection and a great layout.
http://www.pixel2life.com/
Has a large variety of different tutorials from Photoshop to Gimp to Inkscape and even programming.
http://www.color2alpha.com/
Website dedicated to Gimp tutorials. Contains text and video tutorials.
http://professional-tutorials.com/
Graphic tutorials. Mostly Photoshop and Gimp.
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