Use Ful links - 2

http://www.authorize.net/files/gettingstarted.pdf

http://stackoverflow.com/questions/3880574/remove-shipping-methods-completely-from-magento

http://www.magentocommerce.com/boards/viewthread/28838/

http://www.igorkrasnykh.com/2009/02/24/removing-shipping-and-payment-steps/

http://www.magentocommerce.com/wiki/5_-_modules_and_development/checkout/customizing_onepage_checkout_-_remove_shipping_method

http://www.unchi.co.uk/2011/04/04/change-simple-products-into-virtual-products-in-magento/

http://magentist.com/magento_help/choosing-the-right-magento-product-type/

http://www.magentocommerce.com/boards/viewthread/22648/

http://blog.netisme.com/resources/templates/free-admin-templates.html