StrategyWiki
There is a new wiki site that is for user-created game strategy guides, called appropriately enough, StrategyWiki. So far there is not a lot of content for it yet. It’s not that easy to navigate yet, but they plan to add some functionality there. This could be a really great site if it takes off, since it would give anyone the freedom to add to the guides any tips they have for beating a game. A tip, the Works In Progress page is a good way to see what articles are in development there.