I know there've been numerous requests to be able to see visited streets. I +1 that idea.
I'm pretty sure there've also been numerous requests to be able to notate the map. I personally would like to be able to add landmarks and notate the map with locked door locations so the information is there on whichever computer I use for Glitch.
Perhaps making a cartography skill? It can also be used to get info on streets (as in what trees/animals/etc are there)... and probably a few other uses I can't think of right now.