Sorry, missed your last point. I agree that stack overflow and mongo wiki are great resources and I'm not trying to replace these at all.
My aim is to have people post their tutorials and articles in a more centralised place. As for the occasional MongoDB question, perhaps it is better to post at stack overflow, we'll see how things play out and what people prefer.
Anyway, this is more of a instrument for me to learn to develop and manage a website anyway. Thanks again