What is Web 2.0?

Trawling through the RSS feeds today and catching up on the news from blogs here and there, I came across a very simple comparison of the Internet as we knew it (I suppose, in hindsight, Web 1.0) and Web 2.0/read-write web/whatever you want to call it (maybe Internet’s still a perfectly reasonable name?).  This comes courtesy of MartinsWiki:

Web 1.0 was about them, Web 2.0 is about us
Web 1.0 was about reading, Web 2.0 is about writing
Web 1.0 was about companies, Web 2.0 is about communities
Web 1.0 was about advertising, Web 2.0 is about word of mouth
Web 1.0 was about portals, Web 2.0 is about RSS
Web 1.0 was about taxonomy, Web 2.0 is about folksonomy
Web 1.0 was about home pages, Web 2.0 is about blogs
Web 1.0 was information, Web 2.0 is opinion
Web 1.0 was an encyclopedia, Web 2.0 is Wikipedia

It serves a useful purpose to get thought started and provide a very concise overview, but perhaps reading some more (like the research on the same page) could be helpful as well.

Maybe they’re not so much statements as questions?  Perhaps they can serve to spark our discussion around Web 2.0?  If Web 2.0 tools give power to the user, then perhaps what Web 2.0 cannot be concretely defined, because it depends (to a certain extent, at least) on what is shaped by the user?

Maybe Web 2.0 leaves us with more questions asked than answered?