What is Web 2.0?

A hotly debated topic in the blogosphere lately has been, what exactly is Web 2.0? Probably the most concise and comprehensible overview I’v seen is from Adaptive Path: Crucial DNA of Web 2.0

Another must-read piece if you’re interested in this subject is Clay Shirky’s “Ontology is Overrated: Categories, Links, and Tags“. I also recommend Social Bookmarking Tools: A General Review, by Tony Hammond, Timo Hannay, Ben Lund, and Joanna Scott.