Unfortunately, I have an old video and have not played on this seed since 1.2.5 but I have tested it and it still works.
Mode: Default Seed
You will spawn in the forest and to the north is one of the best mountains in the game to obtain ores galore. Under neath is a huge vast cave system and one of the best to build a city on and this is one of the best maps that I have ever played on.
The vast cave system in the Extreme Hills biome is pretty typical, so I wouldn't think of this seed to be particularly special. However, I will concede that the mountains look beautiful compared to a majority of others I've seen.