I dl'd a few tracks off youtube and made a playlist of rain fall that i listen to on my iPod... it's been one of the best things for me getting to sleep, despite the distraction of the earbuds and such.

Here are a few of them:
http://www.youtube.com/watch?v=1pSyYhRYeIM
http://www.youtube.com/watch?v=au036eve4s4
http://www.youtube.com/watch?v=k0gsduLrfSU

gl man...