SearchFox. A free beta bookmark/favourites management toolbar. With sharing and swish search and there’s also an RSS feed in there somewhere, although I don’t think it’s integrated. I’m a Powermarks fan, so not sure if this adds any value to my life (apart from the free bit of course).
Our BETA product lets you tag web favorites with your own words so you can get back to them. It also lets you find what people you trust find useful, valuable, and interesting. SearchFox is designed to integrate seamlessly with the way you search for information and get back to things you use frequently.