I take no credits for this.

Primordial Desert V2
Chunks: 150 x 150
Generation Time: ~1h

MCDungeon:
Generation Time: ~35h ( 5/07/'12 - 21.30 > 7/07/'12 - 08.40 )
Dungeons: 249
Rooms: 74.336
Chunks Used: 20.845

THAT'S JUST A TEST, EVEN IF IT'S GOOD
Real map, v2.0, coming soon...

Took forever to generate this thing without my computer crashing.

I take no credits for this.

33 x 30 chunks x 8 levels
edge: -272, 99, -256
7920 rooms

Tools used:
McTerra - 99 blocks tall 50 x 50 chunks Stone Flatland
McDungeon - Dungeon (you don't say?)

P.S. Spawn set at the center, use this map to find the entrance, it's the tower at the east side...