Forbairt
Teaching / Designing / Developing
There's a book on Sitepoint that you can buy that teaches photoshop thats specifically aimed towards web design. I got a free pdf version, whent hey were being handed out for free, and I can give you a copy if you want, I just have to acknowledge where i got it, etc, etc..
If I had more time I'd be going through the videos on the DVDs I think they are total training or something.
I've access to other training material as well ... and really if you want to go crazy I'd just say go to PSDTUTS and go from there ... you have to give yourself projects I find and work through this kinda stuff.