In 2000 I started experimenting with attaching cameras to balloons in the hopes of recording high altitude images. After many attempts I switched to model rockets fitted with wireless pinhole video cameras. Recently there has been a number of home-made space programs where enterprising would-be NASA scientists have managed--using balloons--to get cameras as high as 100,000 ft, the upper stratosphere. Here is the most recent: The Brooklyn Space Program.
And then one of my videos from 2004--considerably less high, less high rez, less impressive...but equally fun. Here's a link to an 2007 interview with the National Post's Leah Sandals about this project: http://home.golden.net/~andlin/pages/words%20pages/natnlpostsandals.html