This is a GREAT idea. I've got 4 kids and we put them in all sorts of camps/activities in the summer. Last summer they did tennis camp, surf camp, dance camp, baseball camp, art camp, and some others I can't recall. So, this is <i>definitely</i> something I'd use.<p>Now, as for the implementation, here's what frustrates me: <i>You don't serve my city</i> (San Luis Obispo, CA). Furthermore, you don't state anywhere on your home page "Serving San Francisco & Seattle. Put in your email and zip code and we'll notify you when we have your town." You should REALLY do that.<p>For this issue, you should also take a "backwards compatibility" approach (as Chris Dixon put it [1]). Getting more camps in new cities is hard–I get it. But, just about every city in America has a parks and recreation department and most of them publish their summer activities in a PDF guide. So, you get an intern and have him/her gather the URLs to every PDF available in California. Then Oregon. Then Washington and so on. I come to your site and put in my zip code–you say "Hey, we don't have anything in your city yet but here's your local activity guide" BAM ... backwards compatibility.<p>Marketplaces are hard. Keep up the good work.<p>[1] <a href="http://cdixon.org/2009/08/25/six-strategies-for-overcoming-chicken-and-egg-problems/" rel="nofollow">http://cdixon.org/2009/08/25/six-strategies-for-overcoming-c...</a>