Icons Explained: A Guide to Byzantine Icons on the Internet
Wonder-Working Icons at aquarium.ru
Byzantine and Russian Iconography, including encaustic icons from the Monastery of St. Catherine at Mt. Sinai.
For icons of the Novgorod school, see the site about Lord Novgorod the Great and the city's cultural heritage.
Lovely exhibition of icons on the site of Abbazia S. Benedetto in Seregno, Italy.
The Silver Icon Catalog