This is a terrific resource for helping to put this conversation into tangible terms for business leaders. I will definitely be using it - thank you! Two questions:
1. Is the ROI for British Telecom's efforts really "increased" time to competence? One would hope that time to competence is actually reduced using social media, I think.
2. Does anyone have any commentary to share in response to the question, "How do we drive people to these resources so that we maximize their value?"

I would also recommend looking at Deloitte Consulting - their D-Street is an internal facebook of sorts and has had some good (and less than expected) results.