These chips are amazingly cheap, $8.61 qty-100 from DigiKey.
The ST part I am testing:
http://www.st.com/stonline/products/literature/ds/12094/lis3lv02dl.pdf
draws .6mA at 2.5 V and can be set to generate a pulse when a certain acceleration is crossed
I have been having good luck using the Telit GM862 module for a vehicle tracker. Just attach antennas for cell phone and GPS , slide a SIM into the slot, apply power and you have a full functioning cell phone with built in GPS and Python interpreter. 
I created WiFi bathroom scale that posts weights to the web. You can see my live feed here:
http://h1.ripway.com/asmithmd1/2768.txt
and a Graph here
http://h1.ripway.com/asmithmd1/WeightData.html
This is a demonstration project to show connecting a web site to a real-world device. Since my ISP Verizon seems to be blocking all in-bound connections it is no longer on line.
