The three-needle cast off (or bind off for US readers) is a brilliantly simple but neat technique. My favourite sort! You take two sets of live stitches and you join them. There's no messing around with sewing, and as long as you start with the same number of stitches in each of your sets, the knitted fabric will be perfectly lined up with no bunching or uneven-ness that seems to be a by-product of my late-night lack of sewing skills!