The free Firefox browser now includes "Live Bookmarks" RSS support. According to their website:
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.