Here are some assorted projects I have worked on.
waterfet (late 2009): An attempt to build water-driven analogues of modern CMOS integrated circuitry. In collaboration with (and originally conceived by) Joshua Wise.
mobile eye tracker (late 2009): An eye tracker that does not require the user's head to be fixed. A collaboration with Tom Jacques.
This eye tracker uses two cameras (eye camera and scene camera) to allow the head to move while still accurately indicating where the eyes are pointed. It is based largely on information available from openEyes.
This was built to track eye motion when playing video games. Here is a video of it in action.
FPGABoy (2008): A partial implementation of a Game Boy Z80 and other hardware in Verilog, on an FPGA.