They are asking you to rate them here.
I have never heard of about half the people on the list – perhaps they are ‘influential’ in their small circles. Others are celebrities, and they may be influential in distracting people from things that matter. Some used to be influential in the past, or are influential abroad but not here. PZ suggests everyone gives Dawkins a 100%. Sure – the only scientist on the list (although they call him, gasp, an “evolutionist”!!!!).
Watch out – the stuff loads really slowly and it is too easy to give a 50% when your intention is to give a different rating. I have only voted for Elizabeth Edwards (who have since slipped from 14th to 34th place!) because she is the only one I know in person and the only one to have commented on my blog.