(This was going to be a PM, but then I decided there might be others who wanted an answer to this as well, so it ended up being a forum post. Feel free to delete this and answer via PM, Myr, if you don't want it cluttering up this forum).
One quick question: What's the difference between all the groups? OK, so some are functional (Moderators, Administrator), but what about the rest?
The groups are:
Site Administrator
Administrator
Moderator/Author
Hosted Author
Published Author
Advanced Author
Editor
Author
Newbie Author
Members
Newbies
Validating