I have Cat Bhordi's "Socks Soar on Two Circulars" which has a method of converting from dpns to circs. "Sensational Knitted Socks" has all its patterns set up for dpns or circs.
The obvious thing is how to divide the stitches on the needles (two needles instead of 3 or 4). It's mostly not a big deal, but you have to make sure when doing the heel flap, that all the heel stitches are on one needle, and then when you pick up for the gusset, you end up with the heel sole stitches on one needle and the instep (or top of foot) on the other. (Though if you're pattern is not full of cables and texture, even that is not hugely important).
when you get to grafting the toe, make sure it's oriented properly for grafting.
I'm Knittermom9 on Ravelry