Anyone remember Xbox Live 3.0 (Tsunami)?
MS Intros 'Tsunami' Tools for XBox Live Gamers
MS Watch, February, 2004 by Mary Jo Foley
MS plans to introduce over the course of this year a number of new features for its XBox Live gaming audience. Redmond is rolling the features out in the form of a suite of development tools, code-named "Tsunami." The tools will enable new community and content sharing features for Xbox Live gamers, the company says.
I vividly remember them showing a picture of some mapmaking thing as well. Granted, these features never made it, but the possibility is there, and was being worked on even on the original Xbox.