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Pro JavaScript Techniques (Pro)Pro JavaScript Techniques (Pro) by John Resig
Buy new: $29.69 / Used from: $23.48
A must have for seasoned pr intermediate to advanced javascript programmer. Authored by jQuery creator, John Resig.
Learning  jQuery: Better Interaction Design and Web Development with Simple JavaScript TechniquesLearning jQuery: Better Interaction Design and Web Development with Simple JavaScript Techniques by Karl Swedberg
Buy new: $35.99 / Used from: $33.98
Jquery is a nice and simple but powerful way to code the attractive to advanced javascript for your daily web 2.0 development. Learn jQuery from learningjquery.com founder.
Head Rush Ajax (Head First)Head Rush Ajax (Head First) by Brett McLaughlin
Buy new: $26.39 / Used from: $1.83
A fun way to learn AJAX from the famous Head First Series from O'Reilly.
Bulletproof AjaxBulletproof Ajax by Jeremy Keith
Buy new: $26.39 / Used from: $23.19
Bulletproof book now comes to AJAX.
Head First HTML with CSS & XHTMLHead First HTML with CSS & XHTML by Eric Freeman
Buy new: $26.39 / Used from: $21.93
Headfirst series on XHTML & CSS.
Bulletproof Web Design: Improving flexibility and protecting against worst-case scenarios with XHTML and CSS (2nd Edition) (Voices That Matter)Bulletproof Web Design: Improving flexibility and protecting against worst-case scenarios with XHTML and CSS (2nd Edition) (Voices That Matter) by Dan Cederholm
Buy new: $26.39 / Used from: $24.30
A very nice approach on building website with web standard on mind, stand on XHTML & CSS premises, and still maintain look and expandability and growths.
The Definitive Guide to Django: Web Development Done RightThe Definitive Guide to Django: Web Development Done Right by Adrian Holovaty
Buy new: $26.18 / Used from: $19.99
For everyone who dive into Phyton and its Django framework. Really useful to create fast, maintenable, and reliable web 2.0 application.