The UNXposed mailing list, while originally for visual artists form the London area, contains many posts from members regarding calls for works/residencies and other such opportunities.
With the focus being upon experimental film rather than audio-visual or visual music works not all mail may be relevant but then why should we miss out on any opportunity for exposure!
To join the group you need to create (or already own) a Yahoo account. Then you'll need to find the group on Yahoo groups (or follow this link http://groups.yahoo.com/group/unxposed/?v=1&t=search&ch=web...
After you have joined you can automatically get the email messages directed to your usual email address and start finding out about opportunities to get your work out there.
I hope you'll find this useful