Re: Wiki
The wiki is nice for things like party inventory, or being able to provide information and give certain players access to add to your world 'encyclopedia' for certain areas for instance. It primary advantage is giving multiple non-GM individuals the ability to update a common location for information.
Basically it offers improved delegation. To get close to this, you would have to create a post for a user as them (or NPC tied to them) in a locked thread, which would allow them to edit 'their' section, since it is seen as their post.
Additionally, it offers a history, which can also be useful for things like inventory changes. That if anything might be one of the biggest potential important feature attached to the Wiki.
One disadvantage of the Wiki at present is that your RPOL name is displayed instead of your Character name. So if someone was to be posting information as one persona, and another, it is revealed that you are the same player. Not necessarily a giant issue, but it goes counter the typical site policy of obscuring such information.