I built a simple picavet cross to hold and stabilize my camera when I sent it aloft using helium balloons.
A picavet is a self-leveling rig that attaches to a kite or balloon string. The picavet stays level even while the string changes angles when blown by the wind.
Step 1: Making use of "trash" as building material
I wanted to put my Canon SD1100 IS up in the air. I wanted to shoot video not stills and this camera does great video.
The picavet rig will hold the camera level and facing down no matter what angle the balloon string is. The picavet is like a self-leveling marionette platform.
My camera fit into the foam packaging from my G1 phone perfectly.