Ok, the first version of LiveStats is now up on GitHub and in theory can be adapted easily to work with pretty much any website. Ironically I've spent my first hours today investigating browser performance problems that have ultimately let me to the latest generation of Google ads / adnxs.
Worth noting, LiveStats will not use any detectable amount of CPU resource while running and hence will not negatively impact the performance of your web site .. unlike some advertising systems (!)
Code is here; https://github.com/oddjobz/livestats
Currently there is a wordpress plugin available and an SMF plugin will come. (it does work with SMF) Just waiting on approval from Wordpress to get it into the WP SVN repository ...