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Web 2.0's real killer feature are its logos. The Dr. Web Weblog spreads out Web 2.0 logos on a chromatic scale in a clickable list. A rough Babelfish of the German intro:

Really that is meaningful not, me it however for fun made. Follows each quantity of Logos, which lead all together the note beta with itself.

Now if only someone made a composite image, we could see the Average Face of Web 2.0.

Via 3spots, who has some more, er, useful lists of its own.

First, there are the Ajax (or Flash) Startpages (or Homepages) — with commentary on each.

Second, All the digg-style applications: The list — now this one's a monster. Attention all TechCrunch subjects: here's another list of competitors for you.

Beta-Logo-Parade [Dr. Web]
Ajax (or Flash) Startpages (or Homepages) [3spots]
All the digg-style applications: The list !!! [3spots]
Earlier: Logo 2.0 redux [Valleywag]
And: Web 2.0 logo fonts [Valleywag]