Web 2.0 Confusion

It is dawning on me that trying to understand Web 2.0 can be compared to pinning jello against the wall. Have a look at Ian Delaney's piece "10 definitions of Web 2.0 and their shortcomings" and the comments that follow and you will get an idea of where I am coming from. Warning: it gets a little too technogeeky (if it is not a word it should be) at times.