Another interesting audio project. Reminds me of the UK SoundMap from a few years ago. The map itself seems to be lost:( I blogged about that UK Sound Map and joined in with a few boos.
I loved the way the UK Sound Map project allowed anyone to join in by recording an Audioboo and tagging it.
The National Parks Sound Map is a bit more manual, you upload a sound and fill in a form. I just added one to see how it works.