About:
Minecraft is being developed by Markus Persson. You can follow the progress on my blog.
Controls:
WASD to move
Space to jump
R to respawn above the level
G to add a mob
Y to swap mouse Y axis
N to generate a new map
F to toggle rendering distance
1-4 to change building block type
Left mouse button to remove or add a block
Right mouse button to switch editing mode