This is a great topic, and interestingly, Dave hit my favorite poster in the opening post. I, too, am a sucker for the Kellar Walking Through the Woods piece (I only have one of the Nielsen canvas repros, though I did once see the original in Ken Trombly's collection). Also, Dave mentions a David Blaine piece -- I recently framed up his "Above the Below" poster, which is quite a beauty and very interesting. While I have a handful of vintage original posters, the one that speaks to me (figuratively speaking), is the one sheet portrait of Grover George -- the colors are so very intense, and mine even has some pencil guide marks left by the lithographers. It's a relatively common piece, but really quite a find.