I just found BagsReunited.com the other day. It's a great free resource in case your bags don't make it to your destination when you do.
All you do is sign up and you are given a tag number. You can print as many tags as you wish (there are 5 to each printed page) and you just attach them to your bags when you fly.
I am going to laminate mine so they hold up. Or you could put them into a luggage tag.
If your bag is lost you report it lost using a very easy online form. And when it is found the online finder's form is just as easy. When your bag is found you receive an alert via email or, for $4.99 per year, an alert on your cellphone via text.
I really like this because, while I will put my name and phone number on my luggage tag, I don't like to list my address.
For more information check out their FAQs page. Really a great free service.
There are other handy benefits, too, like an itinerary keeper and a contacts list.