Thom Robbins has mentioned that Code Camp III: The Madness will be returning to Microsoft's Waltham, MA office the weekend of March 12-13th. There is a call for speakers.
I was part of Code Camp II, and it was a great success (with at least 400 people attending). This is a free conference with lots of great content in an informal setting.
I am already putting together some ideas for new talks for this conference. Stay tuned.