Dungeon 159 Art Gallery
Dungeon 159 Map Gallery
Dungeon 159 is finally compiled and if you have a DDI subscription you should be able to download the full copy.
But for those who don't, the art and map gallery is still free.
The art pieces can still be useful as handouts and the illustrations from the Ziggurat Beyond Time has got me intrigued.
The map gallery is something I believe everyone has been waiting for and Wizards is really listening to what the fans are saying what makes Dungeon poor before they hit the subscription switch.
Finally, you can get marked and unmarked maps which allows you to give your players handouts without revealing your secrets.