Twitter co-founders Biz Stone and Evan Williams have announced a new project from Obvious. The new company is called Medium.com. Medium has content that is placed in a fluid design similar to Pinterest. The content collections can either be displayed privately similar to a blog or can be collected as contributions from other members. The collections can be sorted by rating and the layout changes dynamically depending on the size of your browser window. Medium is currently in closed beta. Only a small group of users are able to post on Medium, but anybody can sign up through Twitter and rate posts. You can view some of the collections here.