At MIX we released an update to the Tafiti projects that integrates more Windows Live services in it (specifically, presence and P2P messenger APIs that allow one to share search favorites with buddies). You can find the new Tafiti site here: http://tafiti.mslivelabs.com/Default.aspx. This site shows how WL Messenger APIs can allow sites to encourage interaction with peers. Find the project page on Code Plex here