Project Flatline
This is the ultimate Orpheus website. Its got documents, spectres, scenarios and even a tribute to Samuel Haight! Check it out or stop playing!

The Orpheus Group
Want to show your players a website which teases what Orpheus is about before they start the game fully? Tell them to go here! Beautifully done. Just wish the text could be enhanced better.

Ex Libris Nocturnis
Not limited to Orpheus but has some of the best forums on discussing the game.

The Orpheus Guild
Great wallpapers and soon, even more resources to use! And a new World of Darkness rules conversion for the game too!

The Wraith Project
Though focused on Wraith: The Oblivion more, it has amazing articles that tease the imagination. Has a few Orpheus resources too!