Wouldn't it be nice if RSS aggregators had plug-in architectures that allowed you to build internal services that operated on groupings of RSS feeds? I monitor a lot of feeds, and I've noticed that I scan them in a particular order. More personal, less frequent (but still regular) feeds tend to get read early and repeatedly. Bursty, less personal streams get put off, often for days at a time.
I'd like to lump those low priority ones into a group and have my aggregator perform operations on collected items. For example, cluster and summarize them, a.k.a. Google News on the Desktop. Currently, we're in a primitive state where you have to write your own aggregator to try this out.
Dreaming of the ultimate aggregator as platform tool.