Some links:

• The MOO Programmer's Manual (local copy)
• yduJ's Duck Programming Tutorial (local copy/highly recommended)
• Lloyd Blankenship's MOO tutorial (local copy)
• New ArchWizard FAQ (For people starting a new MOO)
• The MOO Cows mailing list FAQ (Very Useful for answering those advanced queries you might have)
• The Tecfa MOO book 1 (Essays on the concept of MOO)
• The Tecfa MOO book 2 (Long and thorough, covers all aspects of MOO playing and programming)
• CDR's programming tutorial from MediaMOO (useful, if a little bizarre)
• Realms of the Imagination (Original themed game list)
• The Lost Library of MOO (Good MOO resources site)
• Miss Manners in MOO (An interesting look at social tendencies in MOO)