What is Audioboo?
AudioBoo is a website and iPhone OS application designed to allow users to post and share sound files on the AudioBoo website.
http://en.wikipedia.org/wiki/AudioBoo (follow link to learn more)
It appears to be remarkably easy to use and has been promoted by the excellent Stephen Fry (follow @stephenfry on twitter).
Here is an example with Stephen Fry speaking: Listen!
Follow Audioboo on twitter: @Audioboo