Spoiler
--> Now includes map mod, which lets you control settings for the map (though I haven't figured out how to make this work properly for multiplayer, yet).
EDIT: Now with proper githubbing goodness: https://github.com/gsmanners/minetest/tree/gsmapper
And available as a pull request for your pulling pleasure: https://github.com/minetest/minetest/pull/1209
EDIT: 0.3 (using some more proper drawing routines)
0.3c (better texture clean up, proper scanning, fixed a few bugs)
0.4b (more fixes, player marker, one big optimization for non-tracking mode)
0.4e (fixes/workarounds and stuff, not too sure but I think it works mostly)
0.5a (radar mode implemented)
0.5b (a few fixes)
0.6 (optimized with tracking in mind, doesn't need quite so long a cool down)
0.6b (a few more fixes)
0.7a (dynamic colors, initial release)