Definitely the best book out there on Ajax techniques. Appendix includes "JavaScript for OO programmers" that is worth the price alone.
Web Development
Books about web development technologies such as ASP.NET and Ruby on Rails.
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The authoritative reference on Rails. DHH's constant whining about how Rails is greater than anything else in the history of man can get tiresome, though.
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Outstanding reference of the Ruby language. People moving from Java or .NET to Rails might want to read this first, although it's not necessary.
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Low on technique, high on inspiration. A worthwhile edition to the online CSS Zen Garden.
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An old but still relevant introduction to what "Information Architects" do. The authors backgrounds are rooted in library sciences, which makes for an interesting read.
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Old but absolutely indespensible. 90% of the non-Ajax tricks you want to accomplish with JavaScript are laid out in the famous O'Reilly "cookbook" style.