Bloxor is a new browser based feed aggregator that is built with XML. It looks and acts much like an email client and is very easy to use. It comes with the ability to import and export a blogroll, add/delete feeds, check for updated feeds, keyboard shortcuts and a customizable interface. A free demo is available at the Bloxor site and registering for an account is free and extremely simple. The only downside I see is that you need to know the feed URL before subscribing to it. It doesn't automatically detect it from a webpage.