Here's the abstract of an article from McKinsey on "How businesses are using Web 2.0" that you can download for free (requires registration):
More than three-fourths of executives who responded to a McKinsey survey say they plan to maintain or increase their investments in technology trends that encourage user collaboration, such as peer-to-peer networking, social networks, and Web services.
More than half say they are pleased with their past Internet investments, though some regret not boosting their own capabilities to exploit technology. More executives said they should have acted faster than slower.
Retailers, who consider their companies cautious investors in the past, are stepping up their pace today. Similarly, many executives in emerging markets such as India and Latin America intend to move more quickly to capture the perceived benefits of these technologies.
In a follow-up discussion, respondents describe how these innovations are creating a new way of bringing technology into businesses, one that is easier to implement and more flexible than traditional top-down approaches. They also offered insights into how and why their companies are using Web 2.0 and where these technologies may offer a sustained competitive edge.