This has been on the back burner for years. Those that do not know much about high altitude ballooning I suggest you check out http://ukhas.org .

NSE1 is currently in development and will contain:
GPS/RTTY tracker – Sends GPS location over a radio signal.
GPS/GSM tracker – Sends GPS location over SMS as a backup.
808 camera – Cheap mini camera to record the flight
Energizer Lithium AA Batteries – Work well at low temperature and are very light.
Foam payload box – keeps everything insulated and together.

Photos can be seen on Flickr