MotionBased is a service available over the Internet that allows you to map and analyze data from Forerunner and several other Garmin GPS models. Basic features are available with a free account. Some functionality (such as distance splits) is only available with a paid account.
A small piece of software on your PC enables you to upload data from your GPS to a user account on the MotionBased web site. Once it's on the web site, you can map, analyze, and share the data with others.
MotionBased is an alternative to Training Center or Logbook. Originally an independent company, MotionBased was acquired by Garmin in 2005.
More information is available from MotionBased's web site.