Do you suffer from second sock syndrome? That is when you finish one sock, and that's great, but one sock is a work of art, while two socks are just a pair. It's just not as exciting to go back and do another one. And what if you run out of yarn on the second sock? There is a cure for second sock syndrome! Knit them both at the same time! It seems like everybody is doing it:

Fun Sun socks on two circs
Double Trouble
Cybersocks 2 Socks on 2 Circulars

Kate has a pair in progress, and there is an article in Knitty about it. That is also what I am doing with my rainbow roving yarn, and I'll get a picture up here shortly. Anybody else?