The IntranetBlog publicizes a report of a survey of "561 organizations of all sizes from across the planet that participated in the Intranet 2.0 Global Survey:

47% have intranet wikis (17% enterprise deployment); 10% have no plans or interest
46% have intranet discussion forums (19% enterprise use); 9% have no plans or interest
46% have intranet instant messaging (29% enterprise use); 21% have no plans or interest
45% have intranet blogs (13% enterprise deployment); 11% have no plans or interest
37% have intranet RSS (13% enterprise use); 12% have no plans or interest
23% have intranet podcasts (6% enterprise deployment); 30% have no plans or interest
19% have intranet social networking (6% enterprise use); 20% have no plans or interest"

A free summarized version of the report.