Enterprise 2.0 - some great posts on the beauty of edge-in adoption

Nic Brisbourne at Esprit has put together a really concise post about the market entry strategy of Enterprise 2.0 companies. I totally agree with his premise and have thought it's one of the most exciting opportunities in the current arena. Maybe I've just missed it, but I'd really like to see a great example of this having worked. Please point me to any great examples, excepting perhaps Salesforce.com, which seems to be used as an exemplar for every enterprise software strategy in the last five years!