http://www.stumbleupon.com/
I think you will like this one! You create an account and install a toolbar:
then you continue your normal browsing. Just as usual.
1] When you like a site you click on "I like it" so you create your own database of links you like.
2] when you dislike a link you click "Nor for me"
The interesting part is when you are "bored", you choose a category and click "Stumble!". It you present you a good (most voted) link of that category:
1] choose a category:
2] click on "Stumble!" you will get a new (good) of your common like page:
believe-me: you will probably find link you would never think about it
of course: I clicked on "I like it" for kvcd.net & kvcd.net/forum (on this last one I was the first user! and I wrote a review
![woot!](https://www.digitalfaq.com/archives/images/smilies/main/woot.gif)
)