Carol, here are a couple of ideas for you. First, I learned a lot about Photoshop from Scott Kelby's Photoshop for Digital Photographers book. I think I've got them all; for CS, CS2 and CS3. Another thing to consider is Epson's Print Academy. They originally had a download program but now they've got an all day seminar. One is scheduled for Boston on February 28. You can find out more at http://www.epson.com/cgi-bin/Store/Prin ... a_home.jsp . Consider becoming a NAPP member (National Association of Photoshop Professionals.) You get Photoshop Magazine plus access to the members area on the website where they've got all kinds of great video tutorials.
Here's my favorite Photoshop tip. Open your image in Photoshop, make a copy by pressing <CTRL> J. Then click on Filter, Choose Sharpen, then Unsharp Mask. Set the amount to 50, Radius to 20 and threshold to 0 and watch what happens. In almost every case the difference is very noticeable and the result is very good. If the sharpening is too much, increase the threshold until you are satisfied with the look. I learned this technique from Chas Glatzer on his New Foundland workshop. Try it, you'll like it.