Qualified Perceptions

http://www.ravelry.com/patterns/library/twinkling-trellis-socks

(Basically, you make the "pick up" stitches while you're doing the heel flap, so you don't have to pick them up later. On normal heel flaps, they never want to come out even, and I often also get holes at the corner of the gusset, but this seems to avoid that too.)