I'm planing to stream image from webcam attached to RPi which will be connected to the Internet with 3g module. Everything will be mounted on a bunch of balloons flying 50 meters above ground level. I'm going to describe everything on my blog (http://sudoxanthippe.wordpress.com/) to help anyone who would like to do something like that in future. This isn't actually complicated project but will be helpful for me (and maybe to else) to learn basics about RPi. I would like to draw on your experience guys, anyone did something similar?