For those not so in-the-know, RSS feeds are a different way of reading content from your favorite sites. The advantage is that all of your content is aggregated into a single location, for easy reading. The main problem is that most every feed-reader sucks or is overpriced. Google has finally polished their free Reader app, and I’ve switched to it exclusively. The big benefit of it is the ability to group feeds by user-defined categories.
I don’t know when Google snuck this in under the radar, but they’ve added the ability to group feeds into folders, and tag individual articles. So if I only want to read my GTD blogs, and maybe ignore my webcomix for a while, it’s no problem.