Just a heads up: we updated the IMUduino design from revision 1.0.5 to 1.0.6 to address some fabrication issues. The new design is now single sided, and is much easier to fabricate. The new PCBs are scheduled to arrive this Friday (April 11, 2015). We expect to start shipping out all IMUduino boards on April 15th, onward.
CTO - Femto.io