There's no one person in charge of updating it; basically anybody with wiki access edits it when they feel like it/see a problem. If you need something changed, you're free to give me a holler by PM or in the IRC. I'm not sure who all else has wiki access, but we try to keep it relatively maintained.
You think it's outdated now, you shoulda seen it before I got to it. There were some dead links, links to years-old versions of things, tools that have been replaced with better, less-crashy ones, etc. Nowadays not everything is in there, but it's at least enough to get people playing the game properly.