If you're a person who just can't stay away from updates from your latest sites, you'll love Monotomy. This very simple and small Mac app allows you to add any RSS feeds you like and be notified when there is a new post.
You can add as many RSS feeds as you like. Once a new story is published, notification centre will notify you of that new story. You can click on that notification and it'll open it up in your web browser.
It's a great way to stay on top of the latest posts. However I wouldn't recommend it if you follow hundreds of feeds, or you'll be notified nearly constantly which becomes very annoying.