Messing around with the edging on the Waterspun poncho, I realized that I was using two different methods of attaching I-cord, and that "How do I work attached I-cord?" is a common question.

Recap:  The first round of I-cord edging was applied to live stitches.  Instead of binding off my last row of the poncho body, I left its stitches on the circs.  Using a DPN and a half-hitch cast on, I cast on four stitches and knit one row of I-cord.  On the second row, I knit three stitches, then did an SSK, working the last stitch of the I-cord together with one stitch of the poncho body.  I worked this way, doing three rows of attached I-cord, followed by one round of "free" I-cord.  This 3:4 ratio of attached rows:total rows kept the edging from being either gathered or ruffled.  When I got all the way around my piece and had incorporated all of the body stitches, I grafted the live stitches at the end of my I-cord to its beginning.

On the second round of I-cord I was not working with live stitches.  Instead, I was picking up stitches along the outer edge of an established row of 4-stitch I-cord.  On the previous round of cord one stitch was "eaten" by the attachment row.  That left three to form the rounded edge.  I used the centermost of these three as my line of attachment.  To do this round of edging, I again cast on four stitches using half-hitches, and knit one row of unattached I-cord.  Then I began working it onto the established round of edging.  On the next row I knit two stitches, then did a SSK and picked up a stitch under both legs of the designated spot on the previously finished I-cord.  In this shot you can see the knit two, the SSK (under my thumb), and the needle thrust under the stitch of the existing I-cord, ready to do the pick-up.

The reason why I didn't use this method to attach the first round of I-cord is that the attachment rows of each method  look different.  Pre-block waviness aside, you can see that the first round of I-cord has a smooth chain-stitch like appearance to its bottom edge.  The second method produces an attachment row that looks rather like crochet, although you can't see the non-crochet look rounded multi-stitch upper edge from this angle:

I prefer the speed of the second round's style of attachment (less fumbling and shifting stitches between needles), but I like the look of the first round's style of attachment.  Note that the reverse of the second round's style is a bit smoother and less leggy.  Sometimes I work it around something clockwise instead of counterclockwise, so that the I-cord's other side presents itself on the public side of my piece.

There's another nifty use for this second method of attachment.  You can use it along with I-cord or a lace edging to make a  decorative seam, or you can use it for counterpanes or pieced blankets, multi-directional or domino-style knitting to join motifs or sections together without sewing.   More on using this for decorative seaming tomorrow.