Fowler Museum of Cultural History - Includes exhibitions and information about tribal arts. Galerie Peter Herrmann - A commercial gallery. Also has a section describing ongoing African art related exhibitions and events elsewhere. In English and German. Hamill Gallery of African Art - A commercial site with nicely documented thematic exhibitions that change every few months.
Past exhibitions are viewable as well.
Kate Peck Kent Collection of West African Textiles - Exhibition and background information on textiles from west Africa. Museum for African Art - New York's Museum for African Art. National Museum of African Art - The National Museum of African Art, Smithsonian Institution. Site includes exhibitions, articles, museum calendar of events. Nigerian Art and Culture - Collection of photos taken during the 1930's, many showing SE Nigerian masks being danced.