I do know not any opera web site. I suspect it is partly due to the fact that opera goers are much older! I would not worry too much - most opera goers are very snobby!
How did you get to see the Queen of Spades - were you in Paris or New York for it (or else were). if you like that one try Engen Onegin - Tchiakovsy sad and brooding lyrical opera. It will be at the ENO next Spring. Unfortunetly it is in English so that means it is unintelligible!
But La Boheme is a must - it is the Swan Lake of Operas (It is the most commonly performed opera at Covent Garden 400 performances against 800 Swan Lakes).
The other opera that you should see is Die Miestersingers. Although it is very long is is fairly approachable and funny (yes it is a comic opera). It has tremedous warmth and humanity to it and one the most gloriously uplifting endings. It has no anti-semetic overtones (unless you are looking for it) or highly pretentious philosphical musings which blight alot of Wagner. Of course you better by a seat for that one because it is over 6 hours long with intermission.