Ranchero software has added a "sort by attention you pay to them" command to its NetNewsWire RSS feed reader:
Ranchero Software: NetNewsWire 2.1b16 Change Notes: Sorting Subscriptions by Attention.... NetNewsWire now tracks more information about what you do and can tell which feeds are more important to you. (This will get better over time, since it has only just started to track info.)
Actions that make a feed rank higher: opening item links, flagging items, posting to weblog, and posting to del.icio.us...
Let's see what it thinks I find most worthy of attention on the internet.... First place: Kevin Drum's Political Animal. Second place: Josh Micah Marshall's Talking Points Memo. Third place: Wonkette.
Clearly I need to wash my mind. Full scrub.