Loetz.com
This fabulous site is a guide to Bohemian art glass makers from 1885 to 1920. Loetz was the premier Bohemian glass works during this period, but the site also provides information on, and showcases the Art Nouveau work of, numerous other Bohemian masters like Max von Spaun, E. Prochaska, Franz Hofstötter, Marie Kirschner and Adolph Beckert. If you're into art glass, this is one of the most beautiful and comprehensive sites you'll find!