Fortunately, I get to do something about it.
I work for Facebook (joined ~3 weeks ago).
Part of my job is to help fix the developer site, documentation, etc. (along with a host of other issues related to developer relations).
We are working on updating the site and docs as fast as we can and this thread is helpful.
If you have any issues/feedback/whatever with our platform docs or API, email me at firstname.lastname@example.org and we'll get them addressed as soon as we can.
In my experience developing a couple of FB apps in the past, the information in the Wiki was absolutely crucial. (I'm talking about the Wiki that was located at http://wiki.developers.facebook.com/ in the past.)