Photoshop has to be one of the hardest of the graphic design programs to get a grip of. I remember thinking I would never understand it when I first started. There are just lots of different ways to accomplish the same thing with photoshop, I know personally I have only scratched the surface of what it is capable of. Jennifer over at Laughing Lion Design has created some video photoshop tutorials which are worth taking a look at to improve your photoshop knowledge.
There are loads of other photoshop tutorials out there if you need them too, take a look at Tutorialized which lists 9082 photoshop tutorials, that should keep you busy for a while 🙂 .
Adobe also have their own video tutorials in all their products including photoshop at www.adobe.com/designcenter/video_workshop/