Peaceful/Nature Sounds mp3s

Anyone have any idea where I can find a good selection of things like these? I remember I used to have a nice library of them before formatting my computer. I had things amongst birds chirping, the light pitter-patter of a little rain shower, rivers running, waterfalls, sounds of a forest, crickets etc. My favorite was one that involved the howling of wolves, very beautiful.

But alas, I've since lost all these and can't remember how I came into them. Does anyone know any where I can find some sounds like these again?

I would love something like this aswell. This guy called Gordon Hempton is a proffesional in recording this kind of stuff, so if anybody has that, they could perhaps erhh... spread it in some umm mysterious and legal way :P

Steve Roach's Darkest Before the Dawn is good, incorporating night sounds from the SW desert.