WB,
I think we always worry for a while that we've messed our kids up when we do something untraditional. I was amazed at how much my kids learned and how much they loved learning when it wasn't a chore. And, like many, many homeschoolers/unschoolers, they were ahead of the game when they decided to go to college. They had no problem getting into the colleges they wanted and haven't had any trouble adjusting and getting good grades.
Which edition of the Teenage Liberation Handbook do you have? The first one has a big section on a family we know from the town we live in. In the revised edition the author asked some of the kids she knew who had strong feelings about unschooling to write little sections. My son has two entries in it which he wrote when he was 16 or 17.
How old is your son now?

Dream of the Circle of Women
by Dahti Blanchard
published May 2004 by Spilled Candy Books
visit: www.dahtiblanchard.com