Combine all ingredients in a bowl and let chicken marinate for at least 2 hours. (I marinated mine for about 48 hours.) Place about 4 or 5 cubes of chicken per skewer and grill on both sides until done. (I popped them in the broiler for about 4 minutes per side.)
This is a light version. You could probably make it taste more peanut buttery by using less soy sauce and more peanut butter, or just more peanut butter.