I often use a left over block and embroider pertinent information on it, such as date, name of the quilt, who it is for and what occasion, who made it and who it is from.
I read somewhere, it is best to put the label on before it is quilted, making it difficult to remove should the quilt be stolen. If the quilt shows up it might have a chance of getting back to it's rightful owner. Personally, I'm thinkin' someone who is stealing stuff would take the t.v. and the computer before they would take the quilt.
M