Dont know if you'll find it usefull, but I'm building a catalog of dark basic challenge entries from the stickied challenges thread on the DBP board.
http://www.thingy-ma-jig.co.uk/new/
I'm going to add a feature where registered users can "rate" some of the entries.
I agree that the codebase should be moderated - although I accept it isn't right now. I think that when content is submitted, it should enter a queue and someone should be appointed to go through the queue and only let in entries that serve some purpose, are well commented so people can learn from them and are generally acceptable.
I personally dont use the codebase - I find its too hard to get what you want.