i always include the name of the quilt, my name, city, state, date (month/year) and depending on who is getting it i include care instructions for the quilt. if it is for a specific person the label at times gets quite personal or even a story. these i usually put on a lower corner of the back, i fuse mine down before adding the binding and fold the binding over to include 2 sides (bottom/side)
sometimes i print it from the computer onto fusable printer fabric, sometimes i write them with a pigma pen, sometimes i quilt the label as part of the quilting. i think every quilt should have a label.