The Second Edition (2002) of Web 101 is a superb book. I respectfully disagree with the Amazon.com review's opinion that the book is "not really" a good value. It is expensive, but worth it. It is very well written, with lots of facts and examples to back up the author's points. The layout of the book may be the best I've ever had the pleasure to see.
Don't let the iguana cartoon on the cover mislead you into thinking it's a lightweight! I would especially recommend this for grade or high school teachers using the Net in their classroom, but anyone who wants a solid, thorough understanding of this topic will enjoy this highly readable work.