Here's an interesting discussion on building isolation booths in your home for voice/overs:
http://www.mvnation.com/phpBB/viewtopic.php?f=22&t=12863&start=0&st=0&sk=t&sd=a
Scroll down to "Whisper Rooms??"
Or build something freestanding, like these:
http://www.integrityenterprisesus.com/acoustic/products.php
A cool DIY version is here:
http://www.soundproofing.org/infopages/portable_sound_control_room.htm
... or, going smaller, this is a brilliant portable design:
http://digitalprosound.digitalmedianet.com/articles/viewarticle.jsp?id=89503
... which sells here:
http://www.harlanhogan.com/store.shtml
Cheers!
