Feedly is a website+browser-plugin that creates a customized newspaper-like start page based on your media subscriptions; RSS, Google Reader, Flickr, Twitter, FriendFeed, etc.
So basically you install the Firefox plugin, tell feedly about the various subscriptions you have scattered around the web and presto! A custom news feed. From there you can do things like share articles to your Twitter or FriendFeed account, etc.
What I like the most is the clean design and layout; Full articles are pulled in to the software so flipping between articles is fast and not as jaunting when moving from site to site. (Of course you lose the aesthetic of the site the article belongs to)
I’ve only just begun using it, but so far I love it.