You can always use Google Trends for websites...but also see 'Hot Social': (an idea only) for comparing the number of bookmarks that any set of pages or website

You can always use Google Trends for websites...but also see 'Hot Social': (an idea only) for comparing the number of bookmarks that any set of pages or websites has received from across a set of social bookmarking sites. http://younoodle.com/startups/hot_social http://younoodle.com/startups/hot_social