Are you talking about moderating the forum or the wiki content? If you're talking about wiki content I would be willing to write and moderate the Bally/Stern repair guide. I already have a ton of unique content but I'm not interested in contributing if it's open for anyone to edit. I would suggest one or two moderators per section. There are a lot of well meaning people who will contribute bad information. I can virtually guarantee it.
I would also be willing to moderate other sections but I don't want to suck up a lot of my time and Bally/Stern is my main area of expertise.
If it's going to be a free for all in terms of edits and moderation I'll just keep posting to my little old site and let someone else steal my work and slap their name on it over at pinwiki
EDIT: I would also like to see people openly credited for the content they've contributed. Not only does it give them the credit they deserve but introduces individual accountability to the accuracy of the content. Allowing links to people's personal sites who have contributed content is also a nice idea. Everyone wins.
One last edit... if there are a group of RPG regulars who are already planning something like this I would suggest trying to get them on board right away. That will be the difference between success and failure (IMO). If we can get the most knowledgeable people to commit to one site then we'll have an awesome resource. If not... then not.
Also consider that pinrepair.com might become free again at any time. Has Clay even commented on all this?