It looks like Fog Creek is adding a Wiki to their bug tracking product Fogbugz. How I know this? Look at Joel’s latest posting. Notice the link to the Wiki? It’s a link to a Fogbugz installation.
If the Wiki is done right, with good integration with the rest of Fogbugz, this could become a very useful feature. We used the Wiki in Trac before we switched to Fogbugz, and it certainly was nice to have.

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It seems that you are right: when you look at http://support.fogcreek.com/default.asp, there is WIKIS section.
We are using FogBugz in our company and currently looking for Wiki. We evaluate different wikis, but Wiki integrated with FogBugz might be interesting.
Good catch, there is indeed a Wiki section on the main site, I haven’t seen it yet. I’m looking forward to the next Fogbugz version, as I’m curious to find out how well they did the Wiki integration.