http://www.interport.net/nycopera/index.html
The New York City Opera home page isn't as flamboyant looking as you'd expect, considering the subject matter, but it is clearly organized and most informative. This site has much to offer, but would be more complete with a few sound bites from the featured operas. A repertory list and ticket information for each opera production (ongoing and new) is presented, and you can access opera synopses, cast lists, and biographies for a dozen great composers.