We recently used the new SignalR library with Kentico to create a realtime "wall" for the MS Society's new Micro-site,
everyconnection.msconnection.org/wall. The library creates an asynchronous connection with the server, allowing the server to push changes to the client. SignalR's asynchronous connections allow us to create a user experience that is much more dynamic, and as such, quite a bit more engaging than a page that only updates when the site is refreshed.