Breizh Cafe: delicious crepes with unusual ingredients. I especially recommend the crepes sucres!
Colette 213 rue St. Honore 75001: Concept store; great place to take friends as it's very trendy and fun!
Poilane (by st. germain): Hands down best pain au chocolat I've ever had in my life, and believe me, I've had a whole lot of pain au chocolats in my time...