Link: http://elitebydesign.com/how-to-master-photoshop-in-just-one-week/

Go from total noob to pro in no time with this nifty how to. A must for any Photoshop beginner.

Link: http://www.dennisplucinik.com/blog/2007/08/28/60-advanced-adobe-photoshop-tutorials/

Something useful for almost everyone here - from web designers to photo re-touchers.