Accelerometer are surprisingly easy to use. I used the ADXL322 Breakout Board from SparkFun (Datasheet) because it has some advantages:
I used two different headers, a male for X & Y, and a screw terminal for power. I do not use Z & ST.
It makes it trivial to connect the accelerometer to an Arduino - I can just connect X & Y to the analog in pins of my choice (here X is connected to 5 and Y is connected to 4) and I can use two wires to connect the power.