This falls under the "Why didn't anyone think/built of this yet?" Where is the global knowledge base? I am sorry, but it is not wikipedia. Wikipedia is what all us know/think to be XYZ?
What you are describing is a place for you to share everything you know about a subject, and I can use to find what 200 other people know about it.
I'm happy you're liking it. I've posted this over HN exactly because I like it, and hope someone will pick it up (I might think about doing it myself, but I'm not exactly a good coder, so who knows if I'd manage).
I know this thread is old, but if anyone is interested and want to talk about it a bit, my email is in my profile :) (also spittie over freenode)
What you are describing is a place for you to share everything you know about a subject, and I can use to find what 200 other people know about it.
This is simple and extremely powerful.