Luis Suarez is the Knowledge Manager, Community Builder & Social Computing Evangelist in the IBM Software Group division and has a great blog and Twitter feed that always has great tidbits on enterprise adoption of 2.0 tools, especially within the realm of knowledge management. IBM has always been an early and successful adopter of enterprise 2.0 tools.
Via the ReadWriteWeb Twitter Feed i saw this post from Suarez on the The Business Case for Enterprise Social Bookmarking: $4.6 Million a Year in Cost Savings! . Nothing like throwing those kind of numbers to get someone interested in reading more. The numbers he references are from 2008, but i agree with the point that he makes that enterprise social tagging/ bookmarking keeps gets ignored but is still an important and rather critical part of a successful Enterprise 2.0 adoption strategy.
If you have been reading my blog for a while you know that i have always been an advocate of social tagging and in 2008 published an ebook on Hybrid Approaches of using Folksonomy (social tagging) and Taxonomy in the Enterprise.