This sounds like a great project you have going! I am putting my carputer together, but am also am unable to afford a LCD screen, so I plan on using this software. I was afraid I was going to have to write my own software, but it appears you have already done a great job!
Just one question, I have bought a 2x40 character matrix display with the intensions to use it with my carputer, what are the possibilities of using it in conjunction with your software? If nothing else, I can probably make Girder display the Winamp information for me on the display without changing your software at all, but using the screen for folder browsing, etc, would be helpful.