I'm interested right now to learn more about the tautological bundle over the Grassmann manifold $G_{k,n}(\mathbb{R})$, but I'm currently having trouble finding the appropriate texts to check out. There's obviously Wikipedia, and I've also found a link to John Milnor's Characteristic Classes, but I'm looking for something that's a little more pointed and directed (an article or two would be ideal).
My main interest in this stemmed from Milnor's lecture (go to 27:00) at Cornell where he described how this bundle space can be used as a classification space for tangent bundles.