Well, we saw in this episode that Locke was trying to draw the map he saw in Lockdown. I keep saying it, but... Locke! There is an interactive version of the map on lost4815162342.com! You can just go there instead of tryign to draw it form memory!
I don't mean to be redundant by reposting this, but I think this map of the island is going to play a big role in the last few episodes of the season, and the other post is in an old episode's forum. The interactive version of the map is located at http://lost4815162342.com/blastmap.htm

What role do you think the map will play?

Neato.

not as much terrain detail as I thought.

we'll make a note of that. we've had a few suggestions. terrain its tough though, we dont know what that island looks like, lol.