I have somewhere between 60 and 70 posters, about 40 - 45 lobbycards, a few flyers, daybills, synopsis-sheets, and around 10 - 15 press photos. It consists mostly of italian stuff. It's a bit hard to point out the most precious ones, but i am a bit proud of owning a complete US lobbycard set of The Last Shark, under the title The Last Jaws, made before the film was sued by Universal. I also like the poster of Addio Zio Tom and Beatrice Cenci. The Robowar and Thunder Warrior-posters are unresistable. The biggest poster i have is for The Big Racket, which is much more than twice the size of the regular 27" X 41" poster. It takes up more than half the wall at my room.
Edit: The Ilona 'Cicciolina' Staller-posters are really unresistable.