Websites and Web 2.0

I’m currently occupied building a small website for a research project looking at web 2.0 activities in early secondary school.  The website aims to explain web 2.0 for school teachers in plain terms, and I’ve been increasingly struck by how difficult it is to expound all the myriad of ideas about web 2.0 and it’s ilk without reverting to techno-talk or jargon.  If anyone out there in Internet land knows of a definition of web 2.0 that is clear and concise let me know ASAP!  I’ll post a link to the research site here when it’s finished.  This may be a line in the sand…