Book recommendations

I need recomendations for good books on the following topics,
WEB 2.0

Focus should be on pragmatic web development and easy language and good understanding of concepts.
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Siva Prasanna KumarPrincipal Solutions ArchitectCommented:
For flex 2 see : 

I fell thats the best because its explains flex w.r.t java technologies also.

For spring and struts I think Manning In action series of books are good for beginners.

For web 2.0 : I am not sure if some one can suggest a book ;) even I wish to reach some web 2.0 book which has some stuff and not fluff.
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