Dion Hinchcliffe of ZDNet has posted a "Enterprise 2.0 Year in Review" article:

Readers of this blog will be familiar with my coverage of Enterprise 2.0 throughout 2006 and by all indications 2007 is very likely the year that it will significantly break out into the enterprise.  CIOs, and more importantly, technology savvy workers are increasingly applying Enterprise 2.0 within their organizations because it can often be adopted very inexpensively, is by its intrinsic nature easy to use (requiring little if any end-user training), and many believe that it can be applied incrementally. This makes Enterprise 2.0 IT-friendly on numerous fronts to deploy by already harried, budget-pressured IT departments that are eager to deliver some low-risk wins.  And informal data does suggest that many organizations will indeed be trying next year to get at the promise of productivity that Enterprise 2.0 tools offers.