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If you do a search at Amazon for web design seo (using the three words) you'll find a few that cover basics as well as sites being "findable" which would be a starting point. Then, when you look at the books, Amazon makes further related suggestions, which makes it very easy to comparison shop.
I do a lot of shopping and looking through books at Amazon, and always try to read excerpts either there or using Google Books, and read the all reviews - and also look at the author's site if they have one, to get an idea of their style and readability.
I'm actually not looking for books that can turn a print designer into a full blown web developer - I'm the one who's actually building the site, writing the source etc and I'm well aware of the technical side, however I've got zero talent for anything graphical, so I work with designers who do the screendesign. They send the layout to me, and I turn it into a working xhtml-page, set up the CMS etc.
The problem I've been facing in the past is that most designers who are very experienced in designing printed products will just work the same way when desiging for the web. Some will just take a screenshot of their browser and treat the visible "blank" space like a page so that everything is perfect for their specific browser and their window-size. They usually don't think about the fact that people might have a smaller or bigger screen, have some fonts not available or have a different OS with a total different font set. They've never known how to scale font size in their browser so they don't think about how it might look if someone was to scale the fonts up to improve readability. Basically, they're doing it as if they were desiging a flyer or a letter head - not considering the special circumstances of the web.
I doubt that they'll read a whole book, I was hoping for a few pages, just a short "don't do this. do that. look out because that won't work. watch your thoughts on this"-tutorial, which does not try to teach them how to design, but rather tells them how to design for the web.
Also, Jakob Nielsen has had articles on it:
Print Design vs. Web Design [useit.com]