One of my sibling teams at MSN has just released the third version of their incubation project - start.com. It looks really slick, has some great features, and from a technical perspective is very cool. Everything is AJAX-ed, with most of the data being fetched at runtime by the client. In fact, my team is working on something using the core Javascript framework that Scott and Steve (among others) authored, and it really has made our client-side interactivity very easy to pull together.
Anyway, check it out here - http://www.start.com/3. There are a couple of questions to answer to get in, but it is worth it!
