Disable Unwanted Magento Core Modules

Zzzz.xml

<?xml version="1.0"?>
<config>
    <modules>
        <Mage_Downloadable>
            <active>false</active>
        </Mage_Downloadable>
        <Mage_Authorizenet>
            <active>false</active>
        </Mage_Authorizenet>
        <Mage_Usa>
            <active>false</active>
        <Mage_Usa>
        <Mage_PaypalUk>
            <active>false</active>
        <Mage_PaypalUk>
        <Mage_GoogleCheckout>
            <active>false</active>
        <Mage_GoogleCheckout>
        <Mage_Tag>
            <active>false</active>
        <Mage_Tag>
        <Mage_ProductAlert>
            <active>false</active>
        <Mage_ProductAlert>
        <Mage_Centinel>
            <active>false</active>
        <Mage_Centinel>
        <Mage_Compiler>
            <active>false</active>
        <Mage_Compiler>
        <Mage_XmlConnect>
            <active>false</active>
        <Mage_XmlConnect>
        <Mage_Poll>
            <active>false</active>
        </Mage_Poll>
        <Phoenix_Moneybookers>
            <active>false</active>
        </Phoenix_Moneybookers>
        <!-- all other modules here -->
    </modules>
</config>