I love the sound of rain. It reminds me of lazy days when I was a kid and would stay home creating little worlds for my dolls, and would play Crash Bandicoot on Playstation with my brother. It reminds me of simpler days, which for some reason I have been thinking a lot about.
As Gabriel Garcia Marquez put it "The heart's memory eliminates the bad and magnifies the good".
Anyway, this is a lovely site, and I've been using it a lot: http://www.rainymood.com/