Guide to gyro and accelerometer with Arduino including Kalman filtering

Using Arduino Sensors
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You should see the datasheets:
The gyro:
http://www.sparkfun.com/datasheets/Sensors/Gyro/PS-ITG-3200-00-01.4.pdf (page 7 - "Sensitivity Scale Facto")
It says 14.375 LSB/(º/s)

The accelerometer
http://www.sparkfun.com/datasheets/Sensors/Accelerometer/ADXL345.pdf (page 3 - "SENSITIVITY")
It depends on your range. So for example if you use -+2g the sensitivity is 256 LSB/g.