SENS-33 ADXL335 analog accelerometer module
The ADXL335 is the latest and greatest from Analog Devices. Runs from 3.3-5V volts (3.3 is suggested), with ratiometric output. That means that 0g measurement output is always at half of the supply voltage Vdd, -3g is at 0v and 3g is at Vdd with full scaling in between.
Pins are already soldered on board, you just have to wire it or plug it in a breadboard!
Resources:
ADXL335 Datasheet: http://www.analog.com/static/
Wiring example: http://wiring.org.co/learning/