This challenge could be subtitled "a walk through my boyfriend's bookcase." My BF has an extensive graphic novel and comic book collection, and though I've dipped into it (Sandman. Bone, and Fables being my particular favorites), I've barely broken the surface of what's there. So this challenge is a really great opportunity for me to sample some of what's available.
My list is:
V for Vendetta - Alan Moore
Astro City: Life in the Big City - Kurt Busiek
Hellblazer: All his Engines - Mike Carey
Hellboy: Odd Jobs - Mike Mignolia
Death: At Death's Door - Jill Thompson
Runaways, Vol 1: Pride & Joy - Brian Vaughn