I do. I have one that says how to care for wool, and a couple with my name.
I don't always use them, but often. One thing I like about them is that if the garment is passed on (like childrens items often are), that the new owner will be able to see that it was hand made, and by whom.
I posted photos of mine in a thread here once, and the place I got them from. It's somewhere in the archives.
KnittingHelp Queen Bee
"There is a vitality, a life force, an energy, a quickening that is translated through you into action, and because there is only one of you in all of time, this expression is unique. And if you block it, it will never exist through any other medium and it will be lost. The world will not have it. It is not your business to determine how good it is nor how valuable nor how it compares with other expressions. It is your business to keep it yours clearly and directly, to keep the channel open. You do not even have to believe in yourself or your work. You have to keep yourself open and aware to the urges that motivate you. Keep the channel open."
— Martha Graham