So fun with buildcraft/industrial craft. I have gold. A lot of gold. In fact, one of my quarries hit a gold vein. I don't have a lot of iron. And the iron I do have is pretty much all directed to machine making. Now, rail making: Remember all that gold I have? I'm thinking powered rails for everything. Also this raises a question: Does redstone signal decay on powered rails?
Also fun with chickens: Obsidian pipes make for easy automated egg gathering. Exponential growth is fun. Also before the baby chickens are full grown graphical errors make them appear to repeatedly fly in and out of their pen. I think I'll stop if it starts happening en masse with all of the chickens.