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You could for example be needing a lot of obsidian because you're building a large tower to overcompensate for something  . |
It's because I'm insane, Havoc. As your wonderful signature so demurely explains, I'm totally and utterly mad.
Otherwise, hooray! Will the Spleef thing create blocks out of the air, or take them out of chests or whatever? (You can hold off answering this until you know the answer.)
I'm happy for the Enderman nerf, since Notch is gonna weaken them later anyway. Mob spawning will be... interesting, but yeah, we shouldn't overdo it. Finding a balance between spawning mobs and going out into the deep wilderness to hunt them with rocks and pointy sticks may prove a challenge in itself.
Feathers are definitely an issue right now, though. If someone has a big stack of eggs we could start a chicken farm without cheating, just some careful management.