OP, great thread!
Was thinking this the other day, having read that kids just stay in and play on computer games/watch tv/get ignored by their parents [erm]
My DD is 8.5. Recently her boundaries have extended so she can call on a friend who lives 2 streets away. As somebody up thread mentioned, I weighed up the risks/made sure I have her friend's mum's phone number etc and decided she could go.
She is out from 10am to 9pm most days (well, she's away on hols with GPs at moment) and comes home when she's hungry/when it's raining/when the other mum's have decided that they should play outside/inside our house 
She knows the boundaries, Friend 1 (down our street), Friend 2 (house at the back of us, but different street), Friend 3 (2 streets away). She has to tell me where she is going and she knows not to go anywhere else.
They aren't 'feral' as some would suggest (in general, not just on MN) but living the life I led during the summer hols. Long, sunny (well..) days with your friends, building dens/eating sweets/making up dance routines/playing endless games from 'house' to 'super models' to 'Springwatch' (seriously!!)
I think that what the media suggest is that the children don't go out, don't get taken to parks, just stay and play computer games/watch TV.
Whereas on this thread, it is clear to me, that although there are some families that do not allow their children to play on their street for various reasons, those families will still take their children to the park and make sure they get a chance to play.
The media (surprise, surprise) are trying to portray those families in a bad light, which is just a bag of bollocks quite frankly.
There are of course children who do sit in and do nothing, with parents who have little interest in them (and children who are allowed to run free with no restrictions) but I like to think, these are few and far between.
Maybe I am just being naive in that thought though 