Matt Hawkins, over at Raspberry Pi Spy, was lucky enough to be sent a Freescale Xtrinsic Sensor Board by Farnell. The board includes:

• MPL3115 – High-Precision Pressure Sensor (50 to 110kPa, 2.5v)
• MAG3110 – Low-power 3D Magnetometer
• MMA8491Q – 3-Axis, Digital Accelerometer

and plugs into the GPIO. It all comes pre-soldered and costs about £12 delivered. Read Matt’s review here.