I received an email from IUMA, today, with a link to www.nowrecording.com. I have not had time to explore it, so I don't know if there is any folk on there or not, but it looks like a really interesting concept with a lot of information for musicians and performers. Here's their welcome blurb:

Hi everyone, and we're really glad to have you on board! The way nowRECORDING works is that you upload a non-finished recording project (in mp3 format) and then request whatever instruments or vocals that you'd like the nowRECORDING community to contribute. It's as simple as that!

The community can browse the database of projects (by style and/or instrument needed), and hopefully the right person will like your project and want to help out. The COOL thing is that the talent base is global, so with a large enough community you might just find that right fit, something you would never find locally. That's what we're after, and we're having a blast...

Enjoy the site and don't hesitate to send us any comments or questions to support@nowRECORDING.com.

Henry and the nowRECORDING Team