chriscl said:If you are looking for Photoshop nous related to photography, and fancy a book to work through, possibly the best one is Martin Evening's Photoshop CS2 for Photographers:
http://www.amazon.co.uk/exec/obidos/ASIN/0240519841/qid=1135936145/sr=2-1/ref=sr_2_3_1/202-7487487-3622252
(hope the link works!)
This is the one I use, and it's extremely good, comes with a companion CD too. Martin Evening is a contributor to "What Digital Camera", and an official Adobe tester, so he knows his stuff!