We have the MMA7660 assembled and tested breakout boards in stock, check out products section under CNC/robotics for $6.50 each
I got the Freescale MMA7660FC 3 axis g sensor displaying rotational information, using Tim Zaman’s Project library, found here: http://www.timzaman.nl/?p=1089&lang=en or here Tim Zaman Project Reference Arduino Code for MMA7660
As the installation instructions say: unzip it in the Libraries directory of your Arduino install. This is tested with Arduino 022 IDE.
Wiring for a 168/328-based Arduino is: DVDD and AVDD to 3.3V, GND to GND, SDA to Analog 4, SCL to Analog 5, as per the Wire library specification here: http://arduino.cc/it/Reference/Wire
So pleased to have this working!