In this post, I mentioned HitMaps. It looks like their service is going through an upgrade. Adding new users and counting for existing users has been suspended, until the upgrade is complete.
OK... the shiny new HitMaps, with an option to allocate yourself to a light or heavy user group, is now running! Check out http://hitmaps.open.ac.uk/ or http://kmi.open.ac.uk/projects/hitmaps/ (same site).Enjoy!-Marc & Jiri ('the HitMaps guys')