are there any web analytics packages that do these sorts of comparisons?

my band played for a crowd of 3500 once -- that felt like a huge mass of people, but it's peanuts in web terms. it'd be fun to see random comparisons to meatspace in your site analytics. e.g., "this week, your site's active users could've sold out madison square garden 8 times" or "your monthly uniques exceed the population of maine."

Three million messages per day is the same volume as those sent by the population of Bulgaria - which has seven million people and 85% mobile telephone usage.