A group of activists and parents has put together a fairly active blog to discuss Seattle Public Schools. From their banner:
Joining together across Seattle to fight for high quality public schools that educate all students to become passionate, lifelong learners.
Not necessarily directly relevant if you live on Mercer Island, but interesting reading, and points to the type of content that would make a good similar effort for Mercer Island. Anybody want to start one? I'll host!