The jogless join as seen on the inner foot/ankle of the sock allows you to be able to knit without the seams in an in the round way. To accomplish this, I will use the example of two circular needles for the sock. Work to within one stitch of the end of needle #1, slip the stitch knitwise, pick up the right leg of the stitch below the first stitch on the 2nd needle (next to the stitch just slipped) and put it on the needle with the slipped stitch; knit into the back of both the slipped stitch and the the stitch just picked up.
*Now, turn, and work back (on the wrong side) on needle #1 and needle #2. Once all the stitches on needle #2 are worked, turn, and work back (right side) on the stitches on needles #2 and #1, except for the last stitch on needle #1. As before, slip the last stitch on needle #1 (knitwise) and pick up the right leg of the stitch next to this stitch on needle #2, put this picked up stitch on the needle with the slipped stitch and knit into the back of both loops (this is like knitting into the back of both stitches for ssk). Turn; repeat from *.
The whole sock may be knit this way, or just in the intarsia portion. Make sure to knit the intarsia portions firmly as knitting back and forth usually produces a looser tension then knitting in the round.
The jogless or South American Join may also be used for lining up stripes knit in the round. Keep working in the round, but after one row in the new color, pick up the stitch below the stitch on the needle (like a lifted increase) on the first stitch of the second round of the new color. Your stripes will be even without a jog. For the pattern, check out http://www.ravelry.com/designers/margie-mitchell