I'm working on a redesign and the new site has 4 sort views, ie. (sort by price, recent, popular) and also has 3 filters, ie. (videos, news, photos). I don't want to incur and huge duplicate content penalty for all these other views and filters. Should I block google from looking at all the other views? Or should I use ajax or javascript for the sorts? I'm also using pretty URLs for each sort /news/popular, would I be better off doing something like /news.php?sort=popular. Does anyone have any clever suggestions?