Back when Greg J. Smith and Max Ritts launched their Toronto Sound Ecology  project, for which they hiked the city and recorded its sounds for an interactive map, we asked  if anyone had heard of any other similar audio tours.
Turns out, Google  had. Its Google Maps partly powers the UK SoundMap , a crowdsourced survey of the acoustic landscape of Britain. Users can register for free via AudioBoo (it's easiest to register with your Twitter account) then submit sound files to the UK SoundMap website via browser or smartphone. The project is a partnership between the British Library  and the Noise Futures Network .
It's been done in the States--see Open Sound New Orleans  and San Diego, California 's sound map. There are more in Belo Horizonte, Brazil , Zurich, Switzerland , and other places  around the world, too.
What's the point? A sound map paints a more thorough sociological picture of a place. And it helps provide a rich historic archive (the UK SoundMap is searchable by place). As the UK SoundMap folks put it, "By capturing sounds of today and contributing to the British LIbrary's digital collections you can help build a permanent researchable resource."
There are some obvious no-no's here. The site itself warns against workplace, staged, or confidential recordings. And someone cursing you out for your bad driving or you belching the alphabet isn't really unique to a particular locale.
The UK SoundMap has begun with sounds of Sheffield and is expected to extend to the rest of the UK later this year. With any luck, we'll finally know exactly what Crapstone  sounds like.