When do you realize that you maybe on to something? At the idea level? The first iteration of the site? Friend and family comments (always positive :)? Or when you get your first paying customer? I guess all of the above. We've been pleasantly surprised at the amount of traffic and the generous feedback on this site. The surprise however? Not much activity for car certificates (yet!). Though the site has really been up for a few days I am astonished to see how much interest there is for our Vacation Certs vs Car Certs. Don't get me wrong as a small company we are grateful for all the business and interest just surprised that Vacation is so much more popular than cars!