This site is very likely impenetrable to the newcomer. You one-box and defect on the True Prisoner's Dilemma, but is that just because of a cached thought, or is it your Tsuyoku Naratai? So I've created the LessWrong Wiki on Wikia. I'd like this to become a respository of useful definitions and links: it can support our discussions here, and create something lasting from the ephemerality of a blog.
badger already created a Wiki, but as you can see in the updates to that article badger and others pretty quickly concluded that TiddlyWiki wouldn't be up to the job. MediaWiki, the software Wikipedia and Wikia use, is the monster of them all, and will give us good support for practically anything we want to do, including mathematical notation. I've ported across a couple of articles from the old wiki onto the new, but many more are needed. The "download" link in TiddlyWiki and a text editor may help.
EDIT: Usernames are global across all of Wikia, so you may not be able to use the same name there as here. Sorry.