Should any of you be interested, I received notification of this conference in Boston, MA:
I believe it's sponsored by Ajaxian.com, and has some interesting speakers (e.g. Dion Almaer and Ben Galbraith, cofounders of Ajaxian.com, Brendon Eich, founder Mozilla Foundation). ?However, there is a fee, and it's not insignificant.
Feel free to let the group know if anyone plans to attend; I believe there is a group discount.