As the name suggests, it clusters its results, which can be very useful. For example if you search on Clusty for "Charles Kennedy" it can separate out for you the results concerning the Lib Dem politician from the results for a firm of attorneys in Texas , and from a New York naturalist.
I asked them today if they have any links or censorship deals with China, and their response was:
Hi, thanks for your interest. We haven't had any contact with the Chinese
government, which is unsurprising because we don't offer a Chinese
I was impressed to get a reply from the CEO himself!
I would be interested to know if anybody in the Lib Dem blogosphere has already tried it.