Adobe Photoshop
I have been a Photoshop user since 1988 and version 2.5. Today's CS5 is actually version 12, so that gives you an idea how long its been and yet I would still not claim to "KNOW" Photoshop. The program is sooooo huge few people know it all. I have used it as a photographer, a web designer and pre-press production worker, so I have delved into areas of the program than most general users never see.
The following is a list of walk-throughs that may be useful. Even though they contain screen grabs from older versions the current dialog boxes are not so different that one could not still follow the procedures.
Effective Digital Imaging.pp - Photography and Photoshop
Fundamentals of Photoshop.pdf - Good basic procedures
scanning_color-correction.pdf - Scanning and color balancing
correct and straighten.ppt - photographing art work the easy way
Improve Your Images with... - fix your photos with Photoshop
I will continue to offer periodical seminars for Photoshop, so check the WFU Professional Development Center to see if one is available. Their site is HERE.