Gwern would be good and I'm happy to volunteer. I am an admin on most MediaWikis I hang out on. (I'm one of the few who is an admin both on Wikipedia and Uncyclopedia ...)
Really, I suggest the basic admin powers - delete things, block spammers - should be granted to almost anyone who actually edits at all and is one of the community. There's almost nothing an admin on a MediaWiki site can do that is irreversible. I wouldn't autogrant them, but they should be widely spread, and the norm should be regarded as "grant" rather than "not grant". In my experience, spreading the powers far and wide saves a lot of social fuss.
(On RW, anyone who edits for more than a few days and isn't a gibbering nutter or obnoxious jerk gets swooped upon and cursed with a +10 mop. The 'crats all but stalk n00bs waiting for their moment. So far there have been no disasters. Remember the Secret of Wikipedia: most people are pretty OK if you set the environment up right.)
It looks like the current LW wiki admins were created when the wiki was started and the list has never been updated. We may need more 'crats too ... I nominate Vladimir Nesov. And Ciphergoth. (Who appears to have previously been one.) Anyone who's been around since it started and still edits is a good prospect for 'crat.
You're now an Admin.
So, as people have probably noticed, there's fairly regular vandalism on the LW wiki which has been taking a while to address and which regular users have been trying to cope with by moving and blanking pages. This is a little silly - it doesn't resolve the problem and just generates more noise in the RSS feed for Recent Changes (to which I've long subscribed).
We need more administrators.
I suggest myself. I'm a longtime LWer with high karma, so I can't be too crazy. More to the point, I currently handle vandalism as an administrator on the Haskell wiki and have done so ~July 2010; I was formerly an administrator on the English Wikipedia (where I have been a contributor since ~2005); nor have I abused access that has been given to me elsewhere (eg. my shell account on http://community.haskell.org, the commit bit on the PredictionBook.com repo, etc.). In general, I think of myself as a wiki-savvy and trustworthy guy.
Administrators are created by bureaucrats; there are currently 3. Rather than simply message Yudkowsky or Matt of Trike, I thought I'd make my request public along the line of Wikipedia's Requests for Adminship.
If people object, please leave comments; if there are any other users who would like to be admins (David Gerard comes to mind as someone I know from Wikipedia and would trust as a LW wiki admin), likewise.