Yoono when its good for you, because it feels so right.
I always liked stumbleupon , the website which tells you stuff you might be interested in. But you had to be proactive, you had to say "I want to stumbleupon".
The next generation of this kind of thing had just arrived, and its called Yoono, and it is really good.
If your on a web page about French chateaus, this unobtrusive bar across your Firefox browser will scroll and say other sites about French Chateaus will be displayed. Or Honda Jazz, or anything you are on a web page about. If something on the list catches your eye ever, you just click it and visit the page.
It has a side bar that you don’t really need and a random site feature as well. All in I really recommend Yoono and a nifty way to open up the internet without any hassle.