If you're a Firefox and Google Reader user and you haven't yet installed the Feedly plugin, you're going to want to install it today after you hear this: Feedly has now integrated its own results - that is, links to the relevant posts from your Google Reader - right into your Google search results. This integration essentially adds a layer of social search directly into Google, and all with no extra work on your part besides simply having installed the plugin.
The Wizz RSS News Reader, is a very simple RSS (Really Simple Syndication) and Atom news aggregator. It is an XUL application, implements as a Firefox extension and is absolutely 100% free of charge. Wizz RSS does NOT contain ANY spyware or adware.