In the latest edition of the McKinsey Quarterly, you find the results of this global survey (in its 3rd year) and analysis by Jacques Bughin, Michael Chui, Andy Miller and others [Online Survey in June 09, 1695 responses].
You can read this article here [full reading after registration] and listen to an interview with Michael Chui.
Two Charts from the paper:
What Technologies to companies use
Company drive value from their Web 2.0 activities and where
Read full article at mckinseyquarterly.com
Interactive: Business and Web 2.0
Explore, track, and customize three years of survey results on how businesses use new Web technologies and tools.