I was not involved in the relevant issues, but I'll explain as best I can, even though I probably shouldn't:
The Fanstuff Wiki was originally closed because of the lack of quality fanstuff. After it was re-opened, it was poorly managed, so it was closed again - permanently this time. As far as I know, the administrators aren't thinking of re-opening it anytime soon - after all, everyone didn't mind having it closed (or so it seemed).
However, if you really want to, you can go to either of these two unofficial successors to the Fanstuff Wiki: http://wuw.clamburger.org
(the community consists of former users of the Fanstuff Wiki, but there isn't much Homestar Runner-related fanstuff), or http://fanstuff2.referata.com/wiki/Main_Page
(almost everything there is related to Homestar Runner).