New to me, perhaps not new to you: Peterson's College and University Feed Directory. Broken down by kind (several examples: Libraries-General, Research Centers, and Schools and Programs) and searchable, it includes hundreds of feeds from academic institutions. Topics are available as OPML feeds.

It is not as comprehensive as I would like (for example, my library's new books feeds and news feeds are not included), but this site does provide a decent overview of what is available in terms of academic feeds. There is an "Add URL function, to which I've submitted the aforementioned feeds.