You can try out Ensemble here.

So far I’ve just aggregated the feeds available from a few places, such as Oxford and the Open University, but it shows how the concept works. Next up I’m tweaking the indexing a bit, and putting in place some code to handle creative commons licenses more intelligently. The idea is that this would sit as a piece of middleware, and that widgets or other web apps can dynamically grab OPML or JSON for user queries.

Hey, that makes 3 spin-offs from one app, not bad going…