Although not free, our PCMSCAN software fully supports the ELM327 sold by myscantool.com.
Our PCMSCAN software includes DashXL technology - the most advanced dashboard system available on the market today.
To see some example dashboards, see here:
http://www.mp3car.com/vbulletin/engine-management-obd-ii-engine-diagnostics-etc/91660-dashboard-design-contest-win-up-200-a.html
You can find out more about PCMSCAN by visitng us here:
http://www.palmerperformance.com