Someone had asked me about traffic patterns on WordPress.com the other day and whether or not they followed a "long tail." I knew the answer was yes, and I guestimated the numbers from memory at around 80% outside the top 10 blogs. It's actually a little more acute: 92.63% of the traffic to WordPress.com is for blogs outside of the top 25. (About 8.4 million pageviews in the past week.) This is from Google Analytics, so doesn't include RSS or anything like that.