I just read the book, Free to Learn, where the author touts the Sudbury Valley School in MA. I live in MA but we live too far from this school so it's not an option for us.

I have heard a bunch of homeschooling parents who created the Macomber Center (http://macombercenter.wordpress.com/) near it - partially in response to the Sudbury Valley and (I think the tuition charged at SVS). I do know there is a gifted homeschooling co-op near it too (http://www.voyagersinc.org/wiki/bin/view/Public/WebHome) - which I have tried out with my 2e/pg ds7.

On paper or digitally the Sudbury Valley School looks receptive to gifted kids, but I think it really depends on the child, their age (maturity/social/emotional state here), what their needs are, how they learn, the other kids, etc. I'm not sure it would work for ds7 if we lived closer and it was feasible since he seems to need to delve deeper in content in some subjects than this school could possibly offer.

From what I understand and have heard about the SVS, it's particularly good for bright kids (probably mg) and might have ADHD symptoms and can't get their needs met at the public schools.