I created http://observer.no.de/ as solo entry for NodeKnockout. It allows you to follow your site's users in real time (or watch a automatically generated recording of it). You can see the mouse movements, scrolls, clicks , JavaScript errors and much more (if you are following them in real time you can also start chat conversation with them :))

See demo: http://observer.no.de/demo Votes: http://nodeknockout.com/teams/speedo

<3 It was an epic competition