A 9 degrees of freedom shield would be great.
Along with sensor fusion, you can get absolute orientation (pitch, row and heading) relative to the north pole!
It could use Bosch Sensortec BMC150  Accelerometer + Magnetometer and BMG160 Gyroscope


http://www.bosch-sensortec.com/en/homepage/products_3/6_axis_sensors_2/ecompass/bmc150/bmc150
http://www.bosch-sensortec.com/en/homepage/products_3/3_axis_sensors/gyroscope_sensors/bmg160/bmg160

We have a 9axis board in development

We have a 9axis board in development

Where are we on this? Is this possible to use a proto board to interface an invensense sensor?

Using the ST LSM9DS0 IMU or the InvenSense MPU-9150 both seem like a great choices for this type of shield. SparkFun has breakout boards for both and repackaging the oblong sticks into a Tinyduino shields would be trivial. Both chips support I2C, and the LSM9DS0 also supports SPI. The LSM9DS0 is pretty cheap as well- $11.61 in single chip and $5.85 in 3000 volume (Digikey).

In the case of the LSM9DS0, setting the other lines for interrupts, I2C/SPI select, Accel/Mag Address Select, and Gyroscope address select, would take up a HUGE amount of pins. Perhaps using a TI TLC59116 16-Channel Fm+ I2C-Bus Constant-Current LED Sink Driver ($3.23 and $1.25 in 1000 quantity [TI]) could be repurposed to be a pin selector using only the I2C bus. That way, only a few pins (2??) would be needed to use the LSM9DS0, which is always a good thing! Check thread http://forum.tiny-circuits.com/index.php?topic=31.msg643#msg643 for further discussion on the TLC59116.

Yes! This would be great, Sorry I didn't see this when I suggested it in a new thread, but here is another vote for this idea!