I came across two fascinating videos taken by HD cams fitted to weather baloons. They both reached the upper atmosphere - over 100,000 feel above earth - before bursting. See images of earth like you never saw before!
Camera: Go Pro Hero HD
Used a cell phone with GPS & Instamapper to report drop location
Bear-4 HD Camera Flight
Camera: Canon Vixia HF20 HD
Flight time: 2Hrs 45min