I was hoping not to start an edition war, here.
Come on guys, no need for an edition war, we're just talking about map challenge. By the looks of it, it will probably not be one. Point is a "challenge" is supposed to challenge you to create a map that follows a theme or set of rules.
Me, I'm not interested in playing 4e now nor probably ever, but as a challenge to create a map - I'm always game to anything that might get me to think about how to best create such a map, any map.
So in my explorations on what is a 4e map, that's different from any other - this is something I whipped up today before going to dinner for Mother's Day. Several members at RPGNet have mentioned that this map is very much 4e - so I seem to be getting a hang of the idea...
This map was inspired by Avatar (the movie), I just seen it for the first time last night at a friend house who has an HD TV and this was a blu-ray disc version (awesome flick by the way.) This is my version of a slightly more generic Sky Mountains map (the Halleluyah Mountains).
Here's a previous map I made for the 4e discussion
The day before I created the map above, I created this map, which really needs the island to the south in a more complete form, but I only made a 24 x 36 map, using Xara again, and in about 3 hours as well. Its not as well done as the previous, but I thought I'd post it as well. Follows the same paradigm as well. This a bridge from the shore to an island. Whether this is a lake or the calm sea, I don't know, just wanted a waterside map.