No rules, open discussion, anything goes.
For readers that have never commented, there is a small link on the bottom of each new message that reads “# Comments”. Go ahead and give that a click, you might be missing out on a world of information you didn’t know about. While you are there, introduce yourselves to everyone.
For new readers that have only read the messages displayed on the main page, take a look through the archives, a substantial amount of information has been put online in the past 6 months. The archives can be found at the bottom of the right hand menu and are categorized by month.