One of the hidden gems in Firefox is the live bookmarks feature. I have only recently begun using it, and I can't see how I ever lived without it. Keeping track of multiple blogs and websites has never been easier, and the integration right into the bookmarks system is so incredibly seamless. I don't doubt that there are more powerful feed aggregator applications, but this feature is just what the doctor ordered for my needs. Now to find more sites to add to my list...