also, check out <a href="http://eyewriter.org" rel="nofollow">http://eyewriter.org</a> for open source info (code / hardware). We've got instructions on instructables and software on svn / google code.<p>I was one of the developers of the software for this project. I can't tell you how great it was to collaborate with tony / TEMPT and to see his drawings come up on the side of the highway. I also worked on the car-font thing that was on HN a while back:<p><a href="http://news.ycombinator.com/item?id=724780" rel="nofollow">http://news.ycombinator.com/item?id=724780</a>