I label mine with the name of the quilt, my name, the recipient's name, and if the block has a name, I give that too. Sometimes I add a little quotation. For my son's wedding quilt I used one I found on the internet:
True love in bloom now fills your life
As you become husband and wife
I gave one to a friend that said:
Friends are golden threads in the quilt of life.
I've used Printed Treasures and printed them off, and I've also used my embroidery machine. At first I didn't think I would label my quilts, but then read something about documenting quilts for historical purposes. I don't think my labels will keep people from using their quilts. I do think they feel special when they receive a quilt conceived and made especially for them. Putting a label on it documents that too.
My grandmother didn't label her quilts. I realized one day that I was the only person left who would know anything about them, and so I donated them to a museum. They are such treasures, and I didn't want some future generation wondering who made them or why. We used most of her quilts, but there were a couple that were kept special.