I've used NetNewsWire as an RSS reader for years. Personally, I don't think it's brilliant, but it's serviceable. A feature I quite like is its ability to sort subscriptions by the "attention" you pay them—the more articles in the feed that you read and open in a browser tab, the higher that subscription drifts over time. After a few weeks, the feeds you pay the most attention to are at the top of the list.
Tonight, my Mac Pro wedged itself somehow and needed a reboot. NetNewsWire was running at the time. I've just fired it up again, and everything has been reset: the historical attention data has been dropped on the floor, and the feeds are now in roughly alphabetical order. It's 2011. How can that kind of user data be so volatile?
So, anyway—NetNewsWire, it's not me, it's you. I'm off to download Reeder.