<?php

require_once 'app/Mage.php';

Mage::app();

$quote = Mage::getModel('sales/quote')
    ->setStoreId(Mage::app()->getStore('default')->getId());

if ('do customer orders') {
    // for customer orders:
    $customer = Mage::getModel('customer/customer')
        ->setWebsiteId(1)
        ->loadByEmail('customer@example.com');
    $quote->assignCustomer($customer);
} else {
    // for guesr orders only:
    $quote->setCustomerEmail('customer@example.com');
}

// add product(s)
$product = Mage::getModel('catalog/product')->load(8);
$buyInfo = array(
    'qty' => 1,
    // custom option id => value id
    // or
    // configurable attribute id => value id
);

/* [adamw] Bundled product options would look like this:

$buyInfo = array(
    "qty" => 1,
    "bundle_option" = array(
        "123" => array(456), //optionid => array( selectionid )
        "124" => array(235)
    )
);

*/
$quote->addProduct($product, new Varien_Object($buyInfo));

$addressData = array(
    'firstname' => 'Test',
    'lastname' => 'Test',
    'street' => 'Sample Street 10',
    'city' => 'Somewhere',
    'postcode' => '123456',
    'telephone' => '123456',
    'country_id' => 'US',
    'region_id' => 12, // id from directory_country_region table
);

$billingAddress = $quote->getBillingAddress()->addData($addressData);
$shippingAddress = $quote->getShippingAddress()->addData($addressData);

$shippingAddress->setCollectShippingRates(true)->collectShippingRates()
        ->setShippingMethod('flatrate_flatrate')
        ->setPaymentMethod('checkmo');


/* [adamw] Free shipping would look like this:

$shippingAddress->setFreeShipping( true )
    ->setCollectShippingRates(true)->collectShippingRates()
    ->setShippingMethod('freeshipping_freeshipping')
    ->setPaymentMethod('checkmo');

*/
$quote->getPayment()->importData(array('method' => 'checkmo'));

$quote->collectTotals()->save();

$service = Mage::getModel('sales/service_quote', $quote);
$service->submitAll();
$order = $service->getOrder();

printf("Created order %s\n", $order->getIncrementId());