Deck View:
Cmd+Right: Next Card
Cmd+Left: Previous Card
Cmd+N: New Card
Cmd+E: Edit Card (again: End Editing)
Cmd+D: Delete Card (again: Confirm Delete)
Cmd+T: Edit Card Title (again: End Editing)
Cmd+O: Toggle Corkboard View
Cmd+M: Move Card (again: Drop Card)
Cmd+S While Moving Card: Stack Card
Cmd+U While Moving Card: Unstack Card
Cmd+Down: Enter Stack
Cmd+Up: Exit Stack
Escape: Close Menu

Corkboard View:
Cmd+Right: Next Card
Cmd+Left: Previous Card
Cmd+Up: Move Up
Cmd+Down: Move Down
Space: Enter Stack
Cmd+Space: Exit Stack
Cmd+N: New Card
Cmd+O: Toggle Deck View
Cmd+D: Delete Card (again: Confirm Delete)
Escape: Dismiss Delete Menu