Don't worry! It's only stuff...

Log in to Admin Panel
http://192.168.1.88/magento/index.php/admin/
user: admin
pass: 123123

create DomU for Magento
http://www.panticz.de/Xen_domU_Magento

backup Magento
# backup filesystem (without product images)
tar -cjf magento.ftp.back.$(date -I).tar.bz2 --exclude=/var/www/magento/media/catalog/product/i/m/* /var/www/magento/
# backup database
mysqldump --password=magento --user=magento magento | bzip2 --best > magento.db.back.$(date -I).sql.bz2

change category order to alphabetic
sed -i "s|setOrder('position', 'ASC')|setOrder('name', 'ASC')|g" ./app/code/core/Mage/Catalog/Model/Resource/Eav/Mysql4/Category.php

reset admin password
echo "UPDATE admin_user SET password=MD5('123123') WHERE username='admin'" | mysql -u root -pterceS magento

Links
http://www.magentocommerce.com/knowledge-base/entry/how-do-i-set-up-product-relations - How do I set up Product Relations
http://www.vodahost.com/vodatalk/magento/39401-magento-grouped-products.html - Magento grouped products
http://www.magentocommerce.com/ - Magento Page
http://www.magentocommerce.com/boards/member/93863 - My profile
http://www.magentocommerce.com/download/noregister - download
http://www.mikesmullin.com/development/automatically-sorting-magento-catalog-categories-alphabetically-via-mysql/
http://www.magentocommerce.com/support/magento-user-guide-book - Magento User Guide
http://docs.magentocommerce.com/ - PHP Documentation
http://www.mikesmullin.com/development/automatically-sorting-magento-catalog-categories-alphabetically-via-mysql/ - sorting magento categories alphabetically