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A good place to start reading about Web 2.0 is with Tim O'Reilly's piece, What Is Web 2.0?.
Also, check out O'Reilly Radar's Web 2.0 section, Web 2.0 and Cloud Computing, Open Source and Cloud Computing, and But What Exactly "Is" Cloud Computing?.
You might be interested in these books:
Web 2.0: A Strategy Guide
Programming Collective Intelligence: Building Smart Web 2.0 Applications
I hope this helps you get started,