Clicky is for real time analytics on your website and blows Google Analytics out of the water!
Clicky offers you a real time overview of what is going on. You can send out an email, a newsletter or a Tweet and see instantly if people are responding! Clicky is also great for mobile devices in detecting them and you can use Clicky on your iPhone!
You can sign up for free on the site. Paid versions allow you to track more sites and keep a longer history of the analytics data