I use two circs, and knit one sock at a time. I am interested in learning about the 2 socks at a time method, though! I just started a pair of socks last night. I learned with Cat Bordhi's book. It was hard to get at first, but once I caught on, there was no turning back! The yarn I am using now is sooooo pretty- Mountain Colors bearfoot yarn, in all shades of purples. The pattern I am trying is called "columbine peak", and it is in the book.