To me, your code looks about right... I only see USPS and you're using that for both domestic and international shipping.... Try this though, just tidied it up but not sure if it'll help:
PHP Code:
<?php
$mc_shipping_methods = array(
'usps' => array('domestic_types' =>
array('FIRST CLASS' => 'First-Class Mail (2 - 5 days)','PRIORITY' => 'Priority Mail (2 - 3 days)',),
'international_types' =>
array('Priority Mail International' => 'Priority Mail International (6 - 10 days)',),),);
$mc_shipping_methods_names = array(
'usps' => 'United States Postal Service (1 x 0.10lbs)',);
?>
If this still doesn't work then are you sure your shipping module is configured correctly in admin/modules/shipping/USPS ?? Could it be that rather than a Google Checkout problem?
Have you read through the Google Checkout Support thread to see if this is discussed there?
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