If you want to have flat rate shipping based on country with different rates for different product categories and charge the shipping per product. Try the following code:

<script type="text/javascript" charset="utf-8">
function updateMyShippingCost() {
 
	// Create variable for total shipping cost
	var totalShippingCost = 0;
 
	// Create an array for Europen countries that have the same shipping cost
	var europeanCountries = new Array("GB", "IE", "DE", "IT", "ES", "FR");
 
	// Set default shipping cost per category
	var shippingCost = {
		DEFAULT: 1,
		dvd: 10,
		tshirt: 20
	};
 
	// Choose the country to ship to
	var country_code = (jQuery("#use_different_addresses").is(":checked") ? $("#shipping_country").val() : $("#customer_country").val());
 
	// Set shipping costs for each category based on country
	switch(country_code) {
		case "AU":
			shippingCost = {
				DEFAULT: 2,
				dvd: 30,
				tshirt: 40
			};
			break;
		case "NZ":
			shippingCost = {
				DEFAULT: 3,
				dvd: 50,
				tshirt: 60
			};
			break;
		case "US":
		case "CA":
			shippingCost = {
				DEFAULT: 4,
				dvd: 70,
				tshirt: 80
			};
			break;
		default:
			// Set shipping cost for the Europen countries defined earlier
			if (jQuery.inArray(country_code, europeanCountries) > -1) {
				shippingCost = {
					DEFAULT: 5,
					dvd: 90,
					tshirt: 100
				};
			}
	}
 
	// Check each category and calculate shipping cost
	jQuery.each(fc_json.products, function(index, options) {
 
		// Calculate the total shipping cost for this category based on the quantity
		var shipping = options.quantity * shippingCost[options.category];
 
		// Add the total shipping cost of this category to the grand total shipping cost
		totalShippingCost += shipping;
	});
 
	// Set the final shipping cost
	FC.checkout.config.orderFlatRateShipping = totalShippingCost;
 
	// Return the shipping cost for initially selected country
	return totalShippingCost;
}
 
jQuery(document).ready(function() {
 
	// Set shipping cost for the initially selected country
	FC.checkout.config.orderFlatRateShipping = updateMyShippingCost();
	FC.checkout.updateShipping(-1);
 
	// Update shipping cost based on categories and country when updating the price
	FC.checkout.overload("updatePriceDisplay", "updateMyShippingCost", null);
 
});
</script>

• http://forum.foxycart.com/comments.php?DiscussionID=4559
• http://forum.foxycart.com/comments.php?DiscussionID=1441&page=2