Please don't get offended, but "Photoshop CS4 for Dummies" is a valid option here, just go to a bookstore andcheck it out, there is a good chance you'll like it. I did [:P]


Look at Scott Kelby's books as well. I do not recommend buying a comprehensive manual (like Martin Evening's "brick")just yet.


The most importantthing here is to start simple, practice often, be patient and not to get discouraged. There is a steep learning curve to Photoshop.


One more piece of advice: color calibrate your monitor, and, if you intend to print your own photos, calibrate your printer, to avoid unnecessary surprises.


Good luck.