In my opinion, Google Reader is one of the best feed readers out there on the Web today. With that said, any tool that makes this better is alright in my book.
The Google Reader Watcher does just this. There are several tools out there that help you get more out of Google Reader but this one does the best job ad giving you updates.
This extension will checks your Google Reader for unread feeds and if you have, the plugin will display them on your browser’s statusbar. Keep your feed addiction going and pick up this extension.