A GPS tracker for my running purposes. Still in-progress, and getting back on track to actually be finished as of August 2014.
Everybody needs to start somewhere... Controlled via charlieplexing with an ATMega328P.
Homemade CNC mill, designed initially for PCB etching, but will also mill aluminum with no problem. High power (for my needs) meets high precision (for my needs) meets low cost (except time).