NOTE - I've made a couple of improvements to this technique - please visit my blog at http://rosemaryknits.blogspot.com/200... and read the added notes, which were added in April of 2009. These improvements greatly improve the productivity of this technique. Check it out!
This is a spinning and plying technique where a length of singles is spun, then Navajo plied back onto the spindle. Another length is spun, then plied, and so on, so that when your spindle is full, it's full of plied yarn! It's the most ingenious technique I've ever seen. Tammy is a genius.