Logos of Web 2.0

In case you haven't seen this -- at FontFeed, there was a nice deconstruction of the look of web 2.0 company logos. (Thanks to a graphic designer I worked with recently for the link. Same could be done on the websites with probably similar results; I feel like I've seen the 37signals look all over the place in the last couple years.) In a non-graphic designery vocabulary, I myself note a lot of blue and orange, more "soft" rounded fonts rather than angular in this selection, and greys and gradients.