Dana suggested the question of the week - needle style - but I thought I'd expand it a little:
What is your favorite method of doing socks? This includes needle style, preferred heel (flap, short row, afterthought, etc), favorite toe, toe up or cuff down, and any other sock method related things you can think of.
My favorite method is DPNs. I've never tried the circular needles (though I love them for just about everything else), but I think working with DPNs for me is relaxing and repetitive. I much prefer heel flaps to any other heel; it just fits my foot better, but I have been known to do one short row (which I didn't care for at all) and I like the forethought heel for certain yarns. And I've never tried toe up, so I'll probably always prefer cuff down, but my next pair will be toe up so I can maximize the yarn.