There’s quite misunderstanding around the net on what web 2.0 really is. We really have to separate the “look and feel” of a website from its purposes. Indeed we should separate websites and services altogether. Web 2.0 has nothing to do with webdesign (take a look at del.icio.us or gmail, no “web 2.0 look” there).
Today we talk about the “design” part. What’s wrongly referenced as “the web 2.0 style” or the “without personality style”.
Elliot Jay Stocks extensively talks about this in his “destroy the web 2.0 look” presentation. He talked about this topic in the “Future of Web Design” speaking at New York, almost a month ago.
Snap2Object has an interesting post on this too with many pictures of common “non web 2.0″ graphic elements.
Obviously there is also an “Analysis of Web 2.0 Design & Layout Trends” at StyleIgnite. Take a look, you may find it interesting.