http://westmd.craigslist.org/zip/4806573615.html Free fill concrete. You tear up and haul. Not responsible for accidents. Best guess it's between 2-4 inches thick 20x30 ft pad.
I liked this one the other day I say on CL... let me see if I can find it, but the gist of it was Free firewood, all you had do was: to have all your own gear, trucks, equipment, arborist insurance and couldn't tear up the lawn and had to take down this huge tree right off a house....
I have to laugh every time I see these posts on CL I can't imagine anyone taking these tightwads up on it, but you never know.