Torque Android project
The more I use this thing, the more I like it. It is a relatively cheap & straightforward project - pretty much ABC 123 to install and setup. The biggest obstacle I encountered was setting my tablet up to recognize then communicate with the ELM OBDII bluetooth adapter, but it wasn't that bad either. The fifth pic is of a compass Android app I found that matches the interior lighting on my Bug, and the sixth and seventh picture don't really need a reason to be there, they just are 'cause they're so freaking awesome.
My stable o' beasts & babes:
2002 Beetle Turbo S - "BeetleJuice"
2001 Ford Ranger XLT
2000 Jeep Cherokee
1990 Mustang LX 5.0 Foxbody - 434,000 miles