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.