Wiki - what a weird word... ok, not really... but to those who haven't heard of it before, it does sound odd at first.
a Wiki is a powerful tool. You can share knowledge that can be edited by others. It's a living document that can track history and changes. The people a pbwiki have provided a great service to us all...
PBWiki is where you can get a free wiki page to share with anyone and everyone (or nobody if you want to keep it private and password protected). Check them out at http://PBwiki.com/! I highly recommend them!