Right now I know I will need a
- weather ballon
- gps tracking capabilities
- a container
I know over at Make magazine they just had a post about a father/son team who sent one up, and SparkFun has some tutorials over on thier site also on things (though I think they may have gone a little overboard for my needs).
I also will have to find a good place to launch from, and source some helium (maybe party city), not sure how much it takes to fill a ballon that size. If anyone has any idea's drop a comment. Once I start getting the project together I will post some updates.