Here's a link to the "new" usage page on Shaw's site:
http://www.shaw.ca/Internet/New-Data-Usage/
They give an option to send your feedback in via email. Most interesting is that you can request an invitation to a discussion about usage. Although time is at a premium, I'm probably going to request one in the hopes that I'll be able to attend.
At the very least, we should all consider sending in a rational email explaining why we think that the proposed UBB structure was flawed, and provide a few suggestions for them that would seem reasonable to us. Complaining on a forum is part of it, and it certainly helped raise awareness about the issue, but this is a pretty direct way that people can get involved.