The thing that makes web2.0 exciting is the prospect of a standardised web -- rss feeds, W3C standard tags, and the notion of 'tag-clouds' to supersede traditional classification methods.
However, with that in mind, I see web2.0 as a phase towards something else. I think it all becomes over-duplicated with many sites copying others rather than producing their own unique idea. Hence, I think the web will centralise much faster in a few years time.
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