I had the opportunity to see Patti Anklam speak at the Conference Board KSEN session on Social Networking and Social / Organizational Network Analysis in September. The depth of her understanding and work in this area shows well when she presents. You can find Patti in Boston or through her website. I would also recommend her book, Net Work. You can find it on Google Books or Amazon. This is an excellent and practical guide to understanding the power of social networks in organizational settings.