This past weekend was the first annual Ecommerce Hack Day in New York organized by Dwolla and Etsy with support from many other companies. I was delighted to be a judge as there were a lot of talented folks working hard on building interesting ecommerce hacks. Here are some of my takeaways from the weekend. First, there are tons of exciting APIs that people can use to build new ecommerce experiences. Marketplaces such as Etsy and eBay have APISs. So do ecommerce sites such as Amazon and Zappo...