ObserverApp.com is free, and it has real time push notifications of every single visitor (try it, open observer in one tab and your site in another - it will in

ObserverApp.com is free, and it has real time push notifications of every single visitor (try it, open observer in one tab and your site in another - it will increment in a matter of seconds). The only problem is that nearly every second ajax link in the admin times out. That's been broken for a long time.