Robla has has asked me to put together a page documenting how I plan to use Bugzilla. For now, I've decided to mostly use the “Priority” field (since it is largely unused) and write up my understanding of the current usage of how “Severity” is used.
You can see the result at http://www.mediawiki.org/wiki/Bugmeister/Bugzilla and I welcome your comments.
Mark.