Shrook is a new contender in the RSS client game. Like NetNewsWire, it sports a simple, Cocoa-based user interface.
It won‘t replace NetNewsWire for me as NNW provides other important features like the Weblog Editor, but Shrook does have some nice features that are still missing from the other program: you can define update times for each channel individually, it has a simple sort view for „new“ news, it marks „opened“ items with an small icon and it allows for more than one level of folders. Best of all: old items get archived when they get kicked off the feed. That way you can follow feeds that fill up fast and that you probably check out not fast enough.