As a college student, I appreciate having a little (printed) note inside the invitation with registry details. It just makes things easier on the guest. Should I go to Target? Bed, Bath, and Beyond? Where? It might not be etiquettely correct, but if it looks nice, I don't see any problem with it.
I actually had a couple of friends who got married, and the bride-to-be didn't want to say where they were registered. People actually said that was a bad / silly idea (I guess - what's the point of registering if people don't know where you are at / what to buy for you?).
Anyways, my sweetie was the best man.
The end.