FeedStore: Offline Feed Reader for Google Chrome
MagicCube FeedStore for Google Reader is a Google Chrome extension that offers offline reading of feeds in the browser.
After installing, FeedStore will synchronize with Google Reader and download all new feeds to local storage. This enables you to read feeds even when you are disconnected from the internet. When a new feed arrives, it is indicated with the icon in the browser actions area. It also shows you the total number of unread feed items.