thousands and thousands of people
it amazes me that over 11,000 people are seeding just one torrent of the latest episode of Battlestar Galactica, and over 17,000 people are downloading it. there are hundreds (even thousands!) more seeding and leeching other torrents of the same show. the number of battlestar galactica nerds who are at this moment sharing the latest bsg torrents is more than twice the number of people in my home town, and it happens every week that there is a new episode.
(numbers according to mininova's stats... where do they get those? how accurate are they? obviously, a single client doesn't connect to 28,000 others; mine usually stops at around 12 peers, regardless of the thousands available)