The amazing official site for the Broadway show: Dance of the Vampires
The official site for the German production: Tanz der Vampire - das neue Musical in Hamburg
A really fabulous site about the show in English: Jim Steinman's Dance of the Vampires
Another great site about the Hamburg show: Tanz der Vampire - das Kultmusical in Hamburg
Fan community for the Broadway production: Dance of the Vampires fan community
A good English site, with English translations of the lyrics: Tanz der Vampire