Do you have a Google Checkout button on your login page and on your shopping cart page?
If not, check your installation, especially where you installed the template files.
If your installation is correct, you will see the full-color icon on your shopping cart page and on your login page when you have items in your shopping cart. You may also see a grayed out version on the login page if there are no items in the shopping cart.
If you don't see it either place, check your installation. Try this thread:
http://www.zen-cart.com/forum/showthread.php?t=74605
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