IMU it is, we have the design completed for one based on the MPU9150, and it should be available for general sale on the webstore in late July / early Aug. We also have a few others that will be available at the same time if you don't need the full 9-axis, like a compass shield and gyro shield (in addition to the existing accelerometer shield).
Although there aren't 10 votes yet, I say we have a winner for the "Free Stuff" suggestion on this one and will hook jcarey5225 with a free one when it's available. And for everyone else who voted on this (Weirdarm, amnipar, akhub, tomcUT and jordyjoe1), we'll give you $10 off coupon to use in the webstore.
Thanks!
Ken