Every few months I organize a hack day at the office, usually on a Saturday. This past Saturday we had our 5th installment of hack/make/tinker day at meltmedia and the turnout was great! Attendance was 8, up from 3 the last time around. YESSS!
Starting the next generation Fitbit Cheat-O-Matic, but changing the name, switching to proper high-end bearings, and make a sturdier base and cam follower mechanism. Should be slick if everything fits nicely and plays nicely.