I'll be updating the wiki software on Friday (22nd) at some point during the day, more than likely between 11am and 2pm.
I've no idea how long it will be offline for but I'm hoping it will be less than 30 minutes.
Any problems, borkage or outbreaks of IE6 please post it in this thread.

Update completed by about 3pm this afternoon; I didn't post anything here as I had to get off to work.
I've done some work on separating the site out a bit, so if people notice broken links, missing docs or other weirdness, post a reply here. Ta.