Check out Opera Glass!
If you can't remember a particular aria from Gounod's "Faust" or a certain detail from the song contest at Wartburg, this site dedicated to opera may be just the ticket. Created and maintained by Rick Bogart, a research scientist at Stanford, the site provides access to libretti, source texts, performance histories, synopses, discographies, and so on.
The site also contains an opera information directory, which features an opera composer index containing 4800 entries. Moving on, those who might be new to the wonders of opera will appreciate the "Opera For Everyone" CD's, which are offered here at no charge. Visitors can use the music here to learn about four classic operas, including "La Traviata" and "Madama Butterfly". The site is rounded out by a list of operas requiring six or fewer singers and a calendar of operatic commemorations.