Web 2.0 is (in priority order):
- A conference
- A handful of technology
- All that social stuff
- A look
One thing I noticed by suddenly engaging with all of those things like Twitter that I actively avoided in the past is that they are all surprisingly usable (WordPress included–this is good stuff). In the last year I’ve really begun to re-evaluate JavaScript and what you can realistically do with it. And I have to admit that the mix of JavaScript and some Flash is a pretty powerful combination (I’ve been playing with Flash charting packages a lot).
Here’s a great summary of some of the leading Web 2.0 looks and UI elements. jQuery continually amazes me.