Ok, I know this post is ancient, but, yes, Ive used it. Actually its my prefferred lossless audio codec. Which kind ticks me of that linux doesnt support it well.
www.wavpack.org has some source files for Linux and mac, but Im not sure what I can really do with them if the audio players dont support wavpack. I think we need to find somebody who would know how to write a plugin to let audio players play .wv (most importantly), and secondly being able to convert to and from would be good too.
Anyhow, thats what I know.
Also see:
http://en.wikipedia.org/wiki/Wavpack
wavpack & wavunpack
