Reporting back on the two at once sock class, as I promised BuduR:
I took Antje Gillingham's class Sunday at my LYS - all 7 hours of it - and we made 2 socks at once on two circulars. Since she wanted to make sure we completed all the techniques in class, we only made baby booties (sorry I don't have any pics - I immediately frogged them to make the full sized version at home).
The technique can be a little daunting at first, but if you have knit one sock at a time on two circulars already, it really isn't too different, so persevere and clarity will come. The knitting is done from two separate balls - one for each sock - each is cast on separately in a manner that allows you to work one half of one sock (Sock A), then the same half of the other sock (Sock B), followed by the other side of Sock B and then Sock A - the pattern is AB-BA-AB-BA-AB-BA-etc.
Her book "Knitting Circles around Socks - Knit two at a time on circular needles" is well written, and is easy to follow. Her technique centers on two disparate circular needles - one 16" and the other 24" - the different lengths help you distinguish between 'sole' and 'instep' stitches, so it's harder to get lost in a stockinette jungle.
Here is her website: