New Media Encyclopedia has numerous sample clips of important early works using video in/as art. Follow the link, then click on the word encyclopedia. The New Media Encyclopedia site is produced by the Centre Georges Pompidou, Musée national d'art moderne, Paris, the Museum Ludwig, Cologne, the Centre pour l'image contemporaine Saint-Gervais Genève, Geneva, and the Centre national des arts plastiques (Fonds national d'art contemporain), Paris