A couple of books I picked up recently are worth recommending based on a little bit of reading... one is Content Networking and the other is Building Scalable Web Sites. I missed most of Web 1.0 working on databases, concurrency, and conflict resolution. These are getting me caught up for Web, er, 2.0.
(Although in Content Networking I noticed they define HTTP as "Hyper Text Transport Protocol" rather than "Transfer". That's not in the errata on the book site.)