Why knit one sock and then start all over again to make a match? Instead, knit two socks at the same time on two circular needles! With this creative approach, you can slip a sock on each foot as soon as you bind off. You can also view all Knitting Circles Around Socks.
I have had other methods of 'two at a time' socks, but this is the best and easiest method I have found. I worked my own pattern out and have zipped through my first pair in less than a week.