NewsGator Toolbar

From NewsGator Technologies:

Subscribing to feeds couldn't be easier. The NewsGator browser toolbar automatically finds RSS feeds on web pages that you are reading (even ones that aren't marked.). With a click of a button, you can preview or subscribe to the feed so it automatically shows up in your favorite reader. It also lets you save (clip) any Web page to your reader even if the page doesn't have a feed, and it lets you see what pages are linking to the page you're viewing with the cool Discussion feature. You can also search NewsGator's huge online database of feeds to quickly add new subscriptions.