This application can log acceleration data and button presses of multiple Wiimotes at the same time. It was designed to do experiments where motion is recorded by one or more Wiimotes. The A & B buttons can be used to mark certain events such as the start or end of an experiment.
The software has been developed and only briefly tested on Mac OS X. It should, however, work on Windows and Linux too. Linux users need to put in a little more effort to make it work. Otherwise, the requirements are almost identical to my Wiimote Whiteboard application. Let me know if you have problems or find any bugs.