I was a walk in 7pm @ Cafe Boulud on Friday night. They told me I could have a patio table for a friend and I for an hour before a reservation showed.
2 Martinis, a dozen oysters, veal sweatbreads and a pork chop. All perfect, more than perfect... can't recomend highly enough. Sometimes New York offers unexpected dining opportunities, and I am glad I grabbed this one. (Outdoor tables are reserved for regulars)