Waterdeep: City of Splendors (a recent 3.5 hardcover) has a "Knight of the Blue Moon" prestige class for followers of Selune or Mystra.
The book isn't in front of me at the moment, but IIRC the entry requirements are:
Feats: Create Magic Arms & Armor, Lunar Magic (detailed elsewhere in the book), Weapon Focus (Heavy Mace) or Exotic Weapon Proficiency (Shuriken)
Ability to Turn Undead
Ability to spontaneously cast 1st level Arcane Spells