I always, always, always label. I guess my thought is, a bazillion years from now, when I'm dead and gone, I want others to know who made it. I just put, "Made with love by XXX. City, State. Month, Year."
I don't know if I would put washing instructions on the label. I always type up a small note, less than 5 sentences on washing, care, and treatment of stains.
Hope this helps!