Cross bookmarks with a feed reader and you get Livemarks, a feature being worked on for future releases of the Firefox web browser. It sounds really interesting:
Livemarks allow you to bookmark an RSS feed and these appear as bookmark folders, with individual items in the feed appearing as bookmarks. Just click on the "bookmark" and you will be taken to the page the item in the RSS feed is pointing to.
...but I would've been a little more excited about it before client-side bookmarks became hopelessly hard to manage. This does sound like an interesting way for those who've yet to choose an aggregator to get into RSS, but I'm not sure it will convert those of us who've gotten used to the creating our own synthetic uber-feeds.
