I’m totally envious. Talk about reducing a barrier to adoption. I wish all sign up forms (and the ones our team is working on) could be as easy, fun and conversational as this. Even for a bank or financial application. The same requests for information could be presented in an engaging way. Also the Huffduffer signup uses progressive engagement, asking for a bit more information at the next step. There are examples all over the web, from Netflix on, of how well this works to draw people in to getting involved with a site or application.