Ryan, I'm always interested in new feed tools. Obviously things have moved on a lot since this post but combinations of powerful filtering tools and easy plugins to existing sources of research information are what I am interested. The use cases are mostly around taking a very broad set of inputs and attempting to pull the important things out of them based on who they came from, what they are, what they are talking about, and whether any of my trusted friends have also flagged it.

Friendfeed has answered a lot of these questions but I'm interested in new approaches as well. Certainly no existing tool has all the answers.