German Music Information Center
The German Music Information Center is part of The International Association of Music Information Centres. There are thousands of links about German music to draw from using their six databases, including listings of opera houses and opera companies with email addresses and Web sites to visit (if you read German).
This non-comercial site provides articles and links about Wagner's "Parsifal." The site also has opera company, opera singer, and Wagner links.
Opera Timelines: German
Students of opera, you'll find this a handy timeline. Review the dates, composers, and operas organized by German, Russian, and Czech.
Richard Wagner Archive
A gentleman from the Department of Cultural History from the University of Turku, Finland, maintains the Wagner Archive site. The goal is to collect and to display all kinds of material dealing with the German composer Richard Wagner. It includes Wagner's operas, writings, and even his family tree.