Mushrooms, big and small, wild and domestic (and everything in between).
I've been growing oyster mushrooms for almost two years now, indoors on plastic bags of wheat straw, seeded with mushroom spawn. This year (4/29/2009), I'm starting to grow several other varieties outdoors on logs. I've also been a hobbyist mushroom hunter for about a decade. I love mushrooms, and I love to chat about 'em.