I was recently reading a Gartner report on market trends in Team and Social Software by Tom Eid and Bianca Francesca Granetto. (The full June 2009 report, called "Market Trends: Web Conferencing, Teaming and Social Software," is available for purchase from Gartner.) The report is very insightful in pointing out "the convergence in technologies and usage across unified communications, Web 2.0, team collaboration and web conferencing."