Here are the ones I read about in deviantArt and liked enough to save the links:
Vectoring in Photoshop -
This site has a bunch of tutorials -
http://www.vexels.net/
I liked this one -
http://peachie.nu/vectortutorial/vector2.html
ALSO, if you have Adobe Illustrator -
Gradient Mesh in Illustrator -
http://www.creativebush.com/gmeshtutorial/
Basic Illustrator tutorials - just lets you know what the feeatures are -
http://www.sketchpad.net/illustrator.htm