I found this seed while looking for a good Nether generation. The Overworld is kinda bare in the area immediately around the spawn, but ive listed a lot of fun stuff you can find with a little walking. The main point of this seed is that if you place a portal near the starting spawn, when you enter the nether you are right in front of a Nether Fortress, as well as a second unatached Nether Fortress very close to the first.
Structures: On, Bonus Chest: On, Cheats: On, World Type: Default
Note: Seed also works up to Snapshot 12w39b
There are lots of ground level lava sources and fissure openings with this seed.
Points to check out: Towns
X: 567, Z:406 (Obsidian in the blacksmith house)
X: 701, Z: 875
X: -346, Z: 200 (Desert, Obsidian in blacksmith house)
X: 1082, Z: 823 (Desert)
Tested on snapshot 12w36a. I built my base across the river at 200,19. I built a nether portal at 218,13 and the nether fortress is there as described. I found three towns nearby but the coords are off from those listed (567,706; -346,200 and 1082,823). Also, if you dig down to about 233,15,-11 there is a lava pool with easy access to diamonds, redstone and gold. There are mob spawners nearby at 227,49,14; 225,49,42; 196,25,-42; 152,18,31.