This is very Prius specific, but along with another Prius driver we are working on a real time visualization of the Prius PSD.
One cool thing is this is done in Flash. I haven't really looked if there are any other front ends written in Flash, but Flash is platform agnostic and a front end written in flash could work under Mac, Window, Linux, etc.
I meant to post to this thread the other day. I went to your web site and checked it out. The stuff you've done with the Prius is amazing. It's very, very cool.