I’ve just recently discovered StumbleUpon. You install a toolbar in your browser which will supply you with a chance to give any website you visit a thumbs up or down. And then there is an advanced “I feel lucky” feature, that will take you to a website that StumbleUpon thinks is relevant for you.
The suggestions are based on what you have marked as good as well as what your friends have marked. It’s a nice feature and it brings up some interesting stuff, but I just can’t decide whether this is actually useful og just a way to kill time.
I had hoped that StumbleUpon could replace ma.gnolia as I am pretty tired of ma.gnolia and want to find somewhere else to store my bookmarks, but StumbleUpon is much better suited as a simple way to find new interesting websites.