This week’s Innovations Pick is one of the coolest we’ve ever featured. Two “tech enthusiasts” (read: brilliant nerds) set up their apartment’s front door to buzz open when they check in to their apartment on Foursquare. They used Foursquare’s 2.0 API, a local push notification service, an industrial web-enabled relay device, some speaker wide, and knowledge of electricity to accomplish the goal. They’re taking the cool factor even further by opening the functionality for other people and hosting a New Year’s Eve party at their place where you have to use the Foursquare check-in to get in. The created a video to both show off their awesome work and invite the public to their party – who’s coming with?