No but I'm in the process of re-facing and redesigning
www.indymix.net to save just that! have a place for collaborations, and a main site to display the creations and other submissions into a viable site.
This design never took off cause an error in code for the submit page didn't send me an email if the uploaded file if it was over 4mbs. and due to it there was really a lack of submission(even when the option was there to email it manually)
Where I live in Newfoundland theres a lot of talented soloists, bands, djs and such that will likely be adding tunes too once they see more than just the admins music. PM me if your interested on it, actually i might start being on irc more too.
but even if SW/GW dies at least we will have a home for the lost souls of the GW Troubadours!