The University of Ohio Libraries has installed a kiosk in the lobby of its Alden Library for the usual quick info requests (hours, staff, maps). But the kiosk also sports a webcam and a link to Skype in order to provide instant reference with a live librarian. Chad Boeninger explains the system in a video on his blog. The system is not heavily used but it's an interesting concept.
An article, refered to in the video, has also been written on the topic: