Much rejoicing! Lots of progress on the LED sign! I now have a working display with full computer control. Sweet. There's still some work to be done, but I really think that the worst is behind me. The main things left are: adding/tweaking some assembly code, improving the PC side software, making a PCB, and finishing up some chassis touches. Keep checking back for progress updates.
Oh yeah, and I also threw up a silly little page for the Rice-a-Roni PIC programmer. :) Stupid, but fun!