I've been wearing bamboo socks for the last 12 months or so, on and off the bike. They are, indeed, antibacterial; I have to remember to wash them at regular intervals, because there's no odor after repeated uses. They're very comfortable, too. I've now retired my cotton blend and wool blend socks.

The only hit against them is that the first bamboo socks I bought were no more durable than wool blend socks. But now I buy bamboo with reinforced heels and toes, and these seem much more durable.