Self Adjusting RSS Reader?

Does anyone know of an RSS reader which adjust the order of your feeds depending on which feeds you tend to click on / spend time reading?

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NetNewsWire (FeedDemon for Windows users) offers an sort by feature where you can sort by name, last update, manual and "attention" where the software computes which feeds grab most of your "attention" (or least of your "attention").

I'm a big fan of Google Reader, but unfortunately it doesn't do this, even though it does track trends in your RSS browsing history.

They could get a lot of mileage by simply prioritizing items depending on what percentage of items you have read in a given feed.

Or if they could add a star rating system...you could rate your own feeds, from one to five stars...five star feed items could come first.

Another feature I'd like to see, is something like what Google News does, and that is to group related items from different sources together, and present a single headline for the lot. If you subscribe to many science/tech feeds, for example, you'll notice the same content repeated many times.