Yarssr - Panel Applet RSS Reader
Yarssr (Yet Another RSS Reader) is an RSS reader for the GNOME panel. It displays an icon in the notification area which changes colour to alert you to feed updates. Clicking on the icon give you a drop out menu, clicking the title takes you to the post in your default browser.
The application hasn't seen much in the way of active development for a while, but that's in part because it works flawlessly at what it does.
Adding a feed
Launch the application and right click on the tray icon, choosing ‘Preferences’.