It's becoming more and more common for grad and undergrad professors to post notes and useful weblinks that relate to their respective subject matter. But this information is random and usually hosted on the faculty member's website at their school. Therefore, when a student googles a search term to learn about a particular idea from a particular subject (such as "t-statistic" or "cost of goods sold", it is hit or miss regarding whether they find useful information.
With the advent of wikis such as wiki-pedia, it would be useful to have a central academic repository where professors (and possibly students) could post notes, links, slides and other information that they don't mind being publicly accessible. Such a website would have to have a system for categorizing and classifying information.
Additional options might include setting up a peer review system and a student review system.
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What you are suggesting is indirectly covered as you have stated, so it would have to gain a lot of momentum (in the way of publicity) in order to take off and be of use.
Like the idea, but it needs more structure.
Could you simply have more people partiicpate in http://en.wikiversity.org/wiki/Wikiversity:Main_Page? or is what you are envisioning less structured?