Ore-wise, it's Coal. But stone, is (obviously) the most obtainable material.
Underground
i think methane is found underground and most metals
There is no word yet as to how Darkrai will be obtainable. Most likely it will be through some sort of real world event.
Abandoned mineshafts are randomly generated, so just look underground.
Corporation piping class 22 or stronger is recommended.
Most famous Minecraft is probably 1.1 version.
Foxes are not in minecraft.
The yogscast are one of the most popular minecraft videos
Modloader, Modloader MP, and most Minecraft mods are completely free. You can download most of them at the Minecraft Forum.
You are most likely in a Mega Taiga biome. It consists of a lot of mossy cobblestone boulders. If you are underground, than you have found a dungeon and can now farm mobs for a lot of exp.
you can get most minecraft mods off the minecraft mods website, or you can google.
Bedrock is the most common but it is not obtainable in survival mode. Next to bedrock there is obsidian which can be made with water and lava so there is basically an infinite amount. Obsidian is explosive resistant and lava resistant. You need a diamond pickaxe to mine obsidian and it can take some time.