[Marcus] sent in his rather interesting g-force logger. He’s posted most of the bits, but hasn’t quite released all the info you’d need to build your own. The most interesting part is the video camera time sync. He used a SD development board for the data logging along with an accelerometer to produce the data. The latest version features selectable internal and external sensors and decent size reduction. I’d like to see something like this combined with a high sensitivity GPS sensor to record skydiving or hangliding.