magento disable checkout with multiple addresses

- Admin - System->Configuration - Left Menu->Sales section->Shipping Settings - Option->"Allow Shipping to multiple addresses" to "No"

magento how to debug sql query

edit this file: lib/varien/Db/Adapter/Pdo/Mysql.php

protected $_debug = true;
protected $_logAllQueries = true;
protected $_debugFile = 'var/debug/sql.txt';

magento import export cms pages

mysqldump cms_page and cms_page_store tables

and restore to your destination database

install magento on debian apt-get install way

sudo apt-get install apache2 mysql-server php5 php5-mysql php-soap php5-mcrypt php5-curl php5-gd

magento add custom fields in account and registration

http://www.magentocommerce.com/wiki/5_-_modules_and_development/customers_and_accounts/registration_fields

http://www.magentocommerce.com/boards/viewthread/9620/