Jeffrey Zeldman should need no introduction to anyone who works on designing and developing on the web. He wrote a book called Taking Your Talent to the Web in 2001 to help print designers transition to web design but, as it was released just in the midst of the dot-com crash, it didn’t do very well.
Now, he’s releasing it as a free download. Some of the material is outdated, but a lot of it holds up. In any case, you can’t argue with the price!