Ross Mayfield has a blog entry about it, complete with excerpts and a link to the complete article, here. Looks like a great piece -- congratulations, Ross!
I've started using SocialText recently along with a team at our foundation. We're in the midst of a whole bunch of strategic planning work, as we try to refocus our efforts for greater impact. We've had incredibly rapid adoption of this new tool, especially for group brainstorming and sharing learnings. This has been especially gratifying since most of the team are pretty agnostic when it comes to technology.
Again, nice job to Ross and his team. Thanks for helping me and my team be more productive during this important phase of our evolution.