I've always felt sound was underrepresented on the web. I carry a Tascam DR-05 around with me in my gear bag, and if find I'm somewhere the sound is interesting, I'll just start recording. Occasionally I pick up something worth sharing.
Kids Eating Shave Ice
Just in case you were wondering what that sounded like
Popping a Homebrew
The delightful sound of a beer that is ready.