Interesting topic and one I've often wondered about, as well.
In practice, however, DS8 is ahead in everything, so what we do winds up looking pretty close to unschooling. I say "What do you want to do today?" and he tells me. Then he does it. That's pretty unschool-y!
Has your DS ever said he doesn't want to do anything or that he'd rather sit around and watch TV or something? LOL, this would be my fear with DS, especially in the beginning. I'm anticipating that the transition into school at home (online charter) will be met with some of these challenges at first, until DS gets over the initial "Hey, I'm not at school" frame of mind. Of course, he may surprise me, but I'm preparing myself anyway. I would really like to utilize some of the free time by following his lead to see where the interests take us. However, an interest in the latest/greatest video game or nicktoon show is not someplace I really want to go.
I guess what I don't quite get is how do you direct the child to interests that they (most likely) have, just aren't aware yet how to pursue without taking away the child-led aspect of it? Is this where de-schooling comes into play?