I wanted to share a video of how we're using the R-Pi as a base station for a GPS Tracking system: http://youtu.be/JOkks0oVsp8
This shows a customized desktop environment for the Raspberry Pi primarily based around Cairo-dock and XFWM4. It has several performance tweaks applied. It furthermore shows the i.AM GPS Mapper application and some of its features running on the Raspberry Pi. Care has been taken to allow best performance on this low power system, but not all optimizations are present in this demo. It also does not take advantage of Wayland/Weston (that's planned for when those become more stable), so everything is done on the CPU and no offloading to the GPU is done for now.
We've done a lot of work on optimizing the performance of the application (and R-Pi Desktop in general). We're also currently on Indiegogo: http://igg.me/p/424464/x/3476322. The goal is to end up with a turn key solution for GPS asset tracking based on the R-Pi and our trackers (one of the funding perks is a complete system).
Let me know what you think!