Reeder
I’ve been using Reeder for both iPhone and iPad for quite sometime and I think it is still the best RSS reader out there, even surpassing Google Reader. These days, I’ve also beta testing Reeder for Mac and have found that it is similarly fantastic.
Although I admit that there are still a few missing features, the basics of what makes Reeder good are all there. A few conventions were copied from the iPad and are slowly refined into the Mac OS X paradigm. As of draft 15, Reeder for Mac looks almost perfect for daily use and is extremely stable for a beta product.
If you read lots of RSS feeds and have a Mac, and would like to get your hands down the rough edges of beta software, do give Reeder for Mac (beta) a whirl here.