I am interested in parallel computation and computer architectures and thought it would be fun to experiment with. I have worked on some projects developing signal processing algorithms for large GPU arrays and I want to see how the Parallela compares. I plan on implementing a real time audio watermarking algorithm and some image/video processing algorithms.
I'd love to see someone design a unique synthesizer (audio) algorithm for these things - hope you'll keep HN updated with any progress you make in that direction.