I signed on to Buzzsaw when it was free. I couldn't get any of my consultants to download & install the software needed to work with it. So I was back to emailing drawings back & forth, a time consuming process that I now charge big bucks for.
If you have one of the low-cost hosting companies (I use webhostingbuzz.com) you can easily set up your own ftp server to share project files with your 'partners'. They also make available phpcollab, a web-based project management application which I have not tried yet, but is on my list. If you try it I would like to hear your impressions. Likewise, If you would like help setting up any of this, let me know:
services@davidlark.net .
David