Dante's Inferno site.
The first image (above) appeared in digg's code, as noted by brentcsutoras, and other sites like IGN, GameSpot and Kotaku also had their source code altered to display Dante-related images. It's one of the cuter, somewhat classier approaches to this title's marketing, and that makes it oddly noteworthy.
If you're wondering why there's nothing in our source code (we're checking now just to make sure) ... we don't let anyone touch that. We consider it to be at least third base and you really have to get to know Joystiq before it's prepared to take the relationship to that level.