Here are the feats that give you 3 spells once per day as a spell like ability. They are all in Complete Arcane:
Communicator: Arcane Mark, Comprehend Languages, Message
Insightful: Detect Magic, Detect Secret Doors, Read Magic
Necropolis Born: Cause Fear, Ghost Sound, Touch of Fatigue
Night Haunt: Dancing Lights, Prestidigitation, Unseen Servant
Soul of the North: Chill Touch, Ray of Frost, Resistance
Spell Hand: Mage Hand, Open/Close, Tenser's Floating Disk
