I recently discovered iTunes U and have been downloading a number of lectures, but I'd like to find more stuff in areas I'm interested in and iTunes U seems to want none of it.

When I select a category of content to choose from - let's say Science -> Physics - the only choices for browsing I seem to have are "Featured" and "New and Notable." I've looked around online and discovered that even the "See All" for these sections only shows a subsection of the entire collection for that category. There doesn't seem to be a regular "Browse" option like you would expect to find in such an application.

Or is there? Does anyone here know if there is such a feature and, if so, where I can find it?