I knew about it from day one. I was even very active with the documentation project on that first day. However I quickly got a distaste for it, there are and were problems with the system.
Personally I don't want blender docs on SO. I don't like the documentation system, and aside from coding questions blender is off topic on SO.
I'm sure not going to stand in the way of the blender tag getting its own docs there, but I am not going to commit to writing the docs. The more blender knowledge the better, I guess.
Yet, if there is this much of a struggle just to get 5 people to commit to starting the documentation (gandalf3 brought this very thing up over three months ago), I wonder how good it will be. The last thing we need is another so-so repository of half done blender knowledge.
So to answer your question, yes I knew about it, but the reason I have not committed (aside from needing more rep in the blender tag on SO even to be able to commit) is because I don't want to.