Read/Write Web has another great post about Web 2.0, this one focusing on API's, and includes this quote
"the philosophy of Web 2.0 is to let go of control, share ideas and code, build on what others have built, free your data."
That is a good summing up, in my opinion.
There is a quote from Robert Scoble about a potential business out there that someone could be building atop the mashed-up web...
I think it is really interesting how, although the philosophy and goals of many a web 2.0 advocate is the "leveling of the playing field"...how people like Scoble and definitely Fred Wilson are putting a top-down spin on innovation that I believe is a new phenomenon. Fred messes around with some new thing, flickr, what have you, and then, every month or so, comes out with a big, well thought out post that says essentially "wouldn't it be cool if...?" ...and I can just see many an entrepeneur nodding their head, and saying, "Yes, yes it would be cool! I have that right here!"...or...."by golly, that is clever...that gives me an idea of another way to think about my gizmo!"
Maybe it goes without saying, but to have the transparency to see/read what the top of the food chain is thinking about/excited about, is really interesting, and I think it actually sends a really positive message that everyone, bottom-up, top-down, are looking for ways to drive innovation.