I've used many methods over the years. I was horrified to hear from one giftee that the Pigma pen label had faded to the point that they could no longer read it! That's when I started machine embroidering labels on the binding before attaching it. I do it so the embroidery will be on the back of the quilt - and I DON'T use contrasting thread, so it will be somewhat subtle. I embroider the name of the quilt, the date, Pieced and quilted by (my name) and the city and state where I live. That way, if my quilts survive and are handed down, they won't be 'mystery quilts.'