FileFront offers downloads of a new map pack for Warhammer 40,000: Dawn of War II. This is described in a post on the Dawn Of War II Website that also points the way for tips on creating maps for the RTS sequel:

With the recent release of our Dawn of War II World Builder, a flurry of map creation has been going on in the community. In addition to brand new maps, several long time fans of the game have recreated their favorite maps from the original Dawn of War game, and Sturmtruppen has been contacting map makers to include them in a map pack for DOW II. The map pack currently contains twenty-seven maps from various authors and is available for download from FileFront, and playing on them is a very simple process of running the installer and then firing up the game. Thanks very much for all your work Sturm, and to all of the map makers involved.

Relic Designer Sacha Narine was checking out the map pack on the weekend and posted some tips for map makers in the thread that everyone might benefit from. If you’re going to try your hand at map making, give them a read! He’s logged more than a few hours in the World Builder.