ST is giving away their discovery kit board for free (click Register for your Free Kit button): http://www.st.com/internet/evalboard/product/254044.jsp
It has a Cortex M4 chip and comes with a magnetometer, accelerometer, and gyroscope. I have one in my possession, but I have not played around with it yet. It's not as small as the IMU boards from SparkFun but still small enough to mount on an HMD.
Free 9DOF Motion Tracker
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Krenzo
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FingerFlinger
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cybereality
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Re: Free 9DOF Motion Tracker
Looks huge compared to the Hillcrest Labs one.