Chrome: If you prefer a simplified, clutter-free interface for your RSS feeds, Google Reader Readable is an extension that cuts all the clutter and displays single posts from your feed in a clean, minimal layout.
If you're a fan of the reading experience you get from the bookmarking services like Instapaper, Read It Later or Readability, but don't want to export posts to another service, Google Reader Readable is a great tool to have on hand. It cuts out the entire interface from the web client of Google Reader and shows just the post you're reading. Move the mouse and you get the sidebar back so you can scroll through your feeds.
It's a nice and simple extension that cuts the clutter away so you can read in peace without bouncing around to different services. Like the previously mentioned Reeder for Chrome, Google Reader Readable is just a skin for the Google Reader homepage so you can do everything you normally can, including starring and sharing posts.