wget http://www.magentocommerce.com/downloads/assets/1.3.2.3/magento-1.3.2.3.tar.gz
If you download Magento from the download page, you see this link http://www.magentocommerce.com/getmagento/1.3.2.3/magento-1.3.2.3.tar.gz. But you can not use wget http://www.magentocommerce.com/getmagento/1.3.2.3/magento-1.3.2.3.tar.gz without specifying referrer. Some technique of anti hot link is implemented there.