Spice Substitutions

Allspice - Cinnamon, cassia, dash of nutmeg or mace or dash of cloves
Aniseed - Fennel seed or a few drops anise extract
Cardamom - Ginger
Chili Powder - Dash bottled hot pepper sauce plus a combination of oregano and cumin
Cinnamon - Nutmeg or allspice (use only 1/4 of the amount)
Cloves - Allspice, cinnamon, or nutmeg
Cumin - Chili powder
Ginger - Allspice, cinnamon, mace or nutmeg
Mace - Allspice, cinnamon, ginger or nutmeg
Nutmeg - Cinnamon, ginger or mace
Saffron - Dash turmeric (for color)

by About.com