Yea the charts are pretty cool. I think they're from Highcharts, which is what I use in my analytics software. Much better than AmCharts imo, which is what I used prior to Highcharts. Highcharts are printable too.
I've been using mixpanel's platform for a couple weeks now and have been super pleased with it overall. Being able to deliver stats to my end users has been a big success.
In comparison with Clicky the pricing is very expensive to track actions on high traffic websites. Probably good for startups in subscription space that have lower traffic / high revenue per user though.
http://f.cl.ly/items/88b19cf0a0964af0e53d/Screen%20shot%2020...