In my past life, I was interested in conducting research on RSS Aggregators, so I’m a bit of an afficianado. On the new Macbook, I use NetNewsWire, but I’m a really big fan of Google Reader.
I use Google Reader a lot, even to the point of hacking around with the unofficial API. I’m always thinking of ways to turn the application into a high powered information trapping tool.
Both GReader and GMail have the ability to star information. GMail one ups Reader though with the experimental Superstars feature. Superstars is basically a hyperfast way to tag items. Adding this to Reader, and then being able to see the results through the API, would be a great addition.