I posted two new melee map concepts on my site:
http://www.jamesjenista.com/sc2concepts.php

New Denver is specifically for 2v2, and adds a twist where each teammate is in a slightly different role.

Vesuvius is a 1v1 with "a ticking time bomb" situation.

I also made updates to the previous three maps I had up, lots of which came about from feedback in this thread:
http://forums.battle.net/thread.html?topicId=22748960934&;sid=3000

Thanks to everyone who posted feedback, I'm really excited about mapping for Starcraft II. And on that note, who else has designs they are working on? I've been poking around the internet looking for people discussing their melee map ideas and I don't see much yet. Here's a good a place as any, throw some designs up, mappers!

I dig the maps and the art style! You should have fun with the Galaxy Map Editor. Keep up the good work.