Virtual camera club member Jeramy sent along a tip that the Sitepoint book, The Photoshop Anthology: 101 Web Design Tips, Tricks & Techniques written by Corrie Haffly, can be downloaded for free. I gave it a spin. I had to provide an email address, and then was sent a link. The download was about 63 MBs. The books itself was written in the Photoshop CS2 era, so it doesn't include some of the latest tools.
That being said, Photoshop Anthology does a good job of covering basic adjustments and techniques, and has lots of goodies for publishing graphics on the Web. The tips are solid and based on good use of layers and other Photoshop standard practices. The layout is attractive and easy to read, even in PDF format. And you certainly can't argue with the price!
Thanks Jeramy for the lead.