Maybe this is old news, but it's new to me. Take a look at:

http://bonesinmotion.com/corp/

This is a service for cell phones that tracks movement and allows the
track log to be downloaded to a website for later viewing. It records
pretty much everything that our gps flight recorders do. Of course, it
is dependent on service coverage. This is targeted at personal fitness
and training markets, but might be useful for soaring. Even if it's not,
something like this might be the future of flight recording.