The shape of your room really dictates the layout of your kitchen. Basically though kitchen shapes fall into the following four categories
L-Shape: As the name suggests the kitchen layout is in the shape of an L. This layout has cupboards and worktops on two sides with a corner unit. The corner unit can be a carousel or a magic corner otherwisw space is lost.
Galley: This layout is made up of two parrallel counter surfaces that usually run the length of the kitchen.
U Shape: This layout has cupboards and workspace on three adjoining sides.
G Shape: This layout has work surfaces on two walls and a third coming off at an angle. This is used where space is of a premium.
L-Shape: As the name suggests the kitchen layout is in the shape of an L. This layout has cupboards and worktops on two sides with a corner unit. The corner unit can be a carousel or a magic corner otherwisw space is lost.
Galley: This layout is made up of two parrallel counter surfaces that usually run the length of the kitchen. 
U Shape: This layout has cupboards and workspace on three adjoining sides. 
G Shape: This layout has work surfaces on two walls and a third coming off at an angle. This is used where space is of a premium.