Trapdoors are now available in Minecraft - what is the crafting recipe to make them?
A hatch, or trapdoor, is created by filling the bottom and middle rows of the crafting table with wooden planks, like so (image from the Minecraft Wiki):
The minecraft wiki calls them trapdoors.
Like doors or ladders, water cannot flow through them, even when open, though it's unclear if Notch will eventually add in this functionality.
On the XB360 and XBONE, PS3, PS4, and Wii U versions of these games, while crafting, you'll usually find trapdoor underneath the door icon, but you need 6 planks to do so!
A hatch (or trapdoor) functions as a horizontal door over a single block hole. It can be activated by right-clicking it or with redstone wire. It is crafted by placing a wooden plank in each of the bottom six slots of a 3x3 crafting grid.