Check out this interesting look at the life of an "unschooler," featured on NPR.
We've never been complete unschoolers, but we've allowed a lot of freedom of choice to our kids.
I was both embarrassed and pleased when my children (then elementary aged) informed someone that "we didn't do school at all this year."
What a compliment; the things we learned and did in the name of learning didn't feel like school!