I also have the book Scott Kelby's 7-Point System for Adobe Photoshop CS3 (No CS4 version out yet), which I have been going through.
Using what little knowledge i have gleaned thus far, I transformed one of my favorite photos from this:
to this:
Three tutorials into the 21 included in this book, and my photos already look much better -- I did my company's Christmas party photography this weekend, and the photos i processed in Photoshop had a professional look to them -- and I have much more to learn yet.
(Click the thumbnails above for a larger photo)
The subject is a Sarracenia 'Dana's Delight' I grow in a bog garden in my back yard, with a tree frog living in it. I call this photo "Symbiosis".