The interactive world map available at No-Kids.org [no-kids.org] shows whoever is intentionally attempting to download a file containing child pornography.
In fact, No-Kids.org is a program embedded in a website that aims to fight the spread of files containing child porn across peer-to-peer networks. Every computer that runs No-kids.org is automatically connected to these networks and pretends to have the files that child porn consumers are searching for (by clearly and unmistakably file names, so that unintentional errors can almost certainly be ruled out). But, instead of those files, the computer sends out a No-Kids.org file that contains a message to seek a place of therapy, instead of child porn content.
Next to the world map, the website show statistics of the global number of downloads over time, collected child porn downloads per city, and the most popular search query terms.
UPDATE: According to some commenters, potentially NSFW. Although no content can be viewed, some textual file names can be revealed.