:) In that sense some of my activities on the startup scene are pretty practical:
http://garage48.org/ - we organize weekend startup bootcamps in Europe and Africa, hopefully having 6+ events in 2011 across Africa. Our goal is to get people into weekend projects, then into startups, then growing out from that "lifestyle" into large world-changing companies.
Web 3.0? That's so 2009. We're on to Web 4.0 in all our apps.
Somebody really should do an analysis of the last ten or fifteen years of this stuff. Some words seem to be perennials. "Cloud" comes to mind. We had tag clouds, social clouds, and now? Just The Cloud.