There have been heaps of discussions on Web 2.0.
As a cultural institution, I found the report produced by Dr Michael Middleton worth a read.
The report is 'Cultural institutions and web 2.0' November 2007. You can find this report at http://eprints.qut.edu.au/archive/00010808/
Another other article 'Web 2.0 can be dangerous' http://www.useit.com/alertbox/web-2.html written by usability guru Jakob Nielsen also worth a read. Happy reading folks.