The world generated using the code -8227252585264349741 is pretty great, and it works for minecraft 1.2.5. You start by spawning right next to an npc village, and only a dozen blocks away is a surface dungeon. The coordinates for the village are X: -122 Z: 231, but you should just see it when you spawn.
If you explore in the cave system beneath the first dungeon you will find a double dungeon with only one mob spawner but 3 chests.
The coordinates for the double dungeon are X: -72 Z: 230
Under the village is a large ravine with a ton of exposed minerals, the coordinates for the ravine are X: -142 Y: 24 Z: 266
Here is a desert island seed for minecraft 1.2.4. You spawn on a treeless island but nearby is a an island with 2 trees on it, swim on over to that. You get a cool island scenario right there, enough resources to get started. But this seed has an extra cool feature that I haven’t seen before. A double dungeon! There are four chests in and two spawners to get you started on your island adventure.
If you explore the cave that the double dungeons are it takes you down a deep shaft and at the bottom there is an abandoned mineshaft. If you keep exploring there is a ravine with a couple of exposed diamonds in it. With tons of resources within close reach this is a super fun island scenario and definately worth a try.