Not only does Vizu have a really nice interface (who's the designer?), but it's based on this power of many, wisdom of crowds philosophy that I'm always talking about. And, unlike Digg, Vizu actually sticks to the rules - you can't see the results of a poll until you've voted, so other people's votes won't affect your decision. Vizu also has widgets that you can place on your blog or MySpace page, just like Quimble and dPolls. From the Vizu about page:
Vizu is where you come to find out what the world thinks...Whether you are interested in predicting the outcome of an event or understanding public opinion on any topic, you can find it on Vizu. Vizu is the most advanced and fun to use public polling service on the web....At Vizu, we believe that large groups of diverse people tend to arrive at better estimates than the so-called experts. And when there is no "right" answer, it is sure interesting to know what people are thinking anyway.