DungHuang Grottoes- China the Beautiful: Frescoes from the caves.
Dunhuang - Caves of the Singing Sands, Buddhist Art from the Silk Road: Provides a large amount of information on the artwork in the caves, as well as images.
Dunhuang Caves In China: A great introduction to the caves of Dunhuang: what they are, who created them, and what they mean.
Dunhuang Social, Economic and Political History: A Social, Economic, and Political History of Dunhuang with lots of background information on the city and region.
Dunhuang, Photographs of the Dunes: Photographs of the dunes at Dunhuang by M. Kageyama.
Dunhuang: The Silk Road Trip: China Tour: A tour of silk-road era Dunhuang with information including lots of dates about the Moago Grottoes and other sights.
International Dunhuang Project: An enormous database of manuscripts and other documents from Dunhuang and other parts of Central Asia.
Silkroad Foundation | Dunhuang Studies: Provides images, a historical timeline, bibliography and news of events.
The Buddhist Art of Dunhuang: Information about, and images of, the caves. From About.com.