Good recipes for marinating turkey include using a brine or a citrus marinate. OhSweetBasil.com has a recipe that calls for marinating turkey breast in a mixture of garlic, fresh basil, black pepper, soy sauce, lemon juice and brown sugar.
To make a citrus-marinated turkey, combine 4 cups of freshly squeezed orange juice, 16 crushed garlic cloves, 1 tablespoon of red pepper flakes, 8 sprigs of fresh rosemary, 8 sprigs of fresh thyme and 2 tablespoons of whole black peppercorns. Add in 1/2 cup of olive oil and freshly grated orange rind. Marinate the turkey for at least two hours before cooking.