An interesting read, especially given IBM's recent direction regarding tagging and social bookmarks within Lotus Connections (specificlly, its dogear component).
1/31/2007 | Memo | Lee Rainie
Just as the internet allows users to create and share their own media, it is also enabling them to organize digital material their own way, rather than relying on pre-existing formats of classifying information.
A December 2006 survey has found that 28% of internet users have tagged or categorized content online such as photos, news stories or blog posts. On a typical day online, 7% of internet users say they tag or categorize online content.
The report features an interview with David Weinberger, a prominent blogger and fellow at Harvard's Berkman Center for Internet & Society.
Source: Pew Internet: Tagging