8274285135238726416Minecraft 1.5 - 1.5.2 Seed
I'm just posting this seed because I thought it was quite a beautiful one.
Seed Code: 8274285135238726416
X: -89 / Y: 67 / Z: 227
If you dig down at these coordinates, you'll appear in a small cave that contains two diamond veins that hold a total of 8 diamonds.
X: -28 / Y: 85 / Z: 231
Dig down from here and you'll find a mine shaft with quite a bit of iron and coal along with a zombie spawner.