I do not know where we could get it but I also love the song and would love it on my iPod.Put it in the iTunes store if nowhere else
The file should be in the audiosurf directory somewhere. It will probably be a .ogg file. You might just have to go through and listen to each .ogg to find the right one.
Hmm... It appears that Audiosurf really does stream the song from the website. Wierd.
You could record the music with FRAPS. If the song is on the site that means you can download it if you can find the directory, pm dylan requesting the link. I believe it uses more bandwith to stream over and over than to stream it