] Live Bookmarks is a new technology in Firefox that lets
] you view RSS news and blog headlines in the bookmarks
] toolbar or bookmarks menu. With one glance, quickly see
] the latest headlines from your favorite sites. Go
] directly to the articles that interest you -- saving you
] time.
]
] A site is enabled for Live Bookmarks when you see this
] icon on the bottom right corner of the browser. Clicking
] on the icon and selecting an RSS feed will bring up the
] Add Bookmark dialog. Select 'OK' and you will see Live
] Bookmarks with the rest of your bookmarks. Many people
] find it especially convenient to save Live Bookmarks in
] their Bookmarks Toolbar folder.

This rules.

Mozilla Firefox - Live Bookmarks