I know we all differ, even under the unschooling umbrella, in terms of how we approach the amount of tv/computers etc our kids watch. That's cool, we all have different experiences, situations, etc.
I am interested though, do you limit certain kinds of shows? I suppose I'm thinking of the obvious stuff that gives a show one rating or another (sex, violence, language, "adult themes"-and I can see the argument for limiting for only certain of these).
If you had a kid dead set on watching something you felt deeply inappropriate, would your bottom line be that they shouldn't watch it, or that they could? I'm assuming you've already tried guiding and discussing with them in this situation, obviously. And I know its something many of us get to sidestep in actuality, I'm more interested in where your bottom line would be. If you had six year old who wanted to watch The Blair Witch Project-and I know of such six year olds!- would you let them?
Right now my kids are happy to accept my guidance as to what they can watch and we tend not to go above a 12A (I don't know the US equivalent but this means that its advised only for kids over 12 but that parents can exercise discretion-this would be The Hobbit or Star Trek ) for my 10 year old and to an extent my 8 year old. We'd tend routinely to be more in the PG (bit scary, parental discretion but all ages) bracket. My 5 year old I restrict far, far more. I don't restrict for language and I don't restrict especially for sex (though there's not much in a 12A!), and certainly not for stuff like nudity, but I do restrict for violence, because this scares my kids. I know other families who are the opposite, who would object to a naked woman onscreen but would be ok with graphic violence.
My bottom line, my point of last resort, would be a "no, you cannot watch something that scary". But I know families who would not say this. I'm interested in where people here draw the line.
I don't think there is a right or wrong way to do this. I think all of us will be doing what is right for our kids, I'm just interested - purely nosily curious- in how different families work with this one.