If you’re interested in the whole evolution of the internet you’ll much enjoy this post on Jeffrey Zeldman’s blog. It get’s really interesting once you go through the comments. Here’s a small excerpt:

Web 1.0: AOL buys Time Warner.
Web 2.0: Google buys YouTube.

Web 1.0: Crap sites on Geocities.
Web 2.0: Crap sites on MySpace.

Web 1.0: Bookmarking.
Web 2.0: Bookmark sharing.

Web 1.0: Writing.
Web 2.0: Rating.

Web 1.0: Pointless Flash widgets.
Web 2.0: Pointless