I label all my quilts, except the ones I give to the guild for charity. The guild adds a generic label, because they don't want to give out members' names.
I do 3 methods: originally I used to just use the printable fabric label and sew it on, but now (still using printable fabric for 99% of my labels) I either include the label as part of the backing, or I fuse it on and then sew it on (I place it in the lower right corner, so it gets sewn in the binding).