Powered by Topsy API, I created this rank checker prototype to calculate the Twitter rank of your website which indicates your realtime search visibility.
Make your emails pop with signatures that reflect your personality and change with every email you send! Create signatures with your twitter status, flickr photos, blog entries, youtube stream and much more, all realtime.
we are just seeing the begining of XMPP/Push architectures replacing RSS/Pull for delivery of activity streams. This will enable many new use cases and services, most of them we probably don't even imagine today !