Real-time mapping in game or in a web browser as you explore!
Check out http://journeymap.info/Server for information and configuration details.
Need to generate large map images?
Check out the JourneyMap Tools project.
JourneyMap uses ModInfo to send a single anonymous packet to Google Analytics when the mod is loaded for the very first time. This provides the authors with very basic stats about what versions of JourneyMap and Minecraft to support, along with your display size and preferred language. No personally-identifying data is used or tracked. See ModInfo for information on how to opt-out.