I have just written my first attempt at creating rain. The script works by using 65 rain drop dots that are each assigned a random scale value, random alpha value, and random position on the screen 30 times per second. 

Link: http://collegiatelabs.com/chris/rainprogram.html

The current version could use some work. The rain appears to be a little longer than I had imagined, not to mention I feel as though we may need some more drops in the final project. In any event I feel as though it’s a good first attempt at creating some good rain for our project.