Posting in the Magento forums has been disabled pending the implementation of a new and improved forum solution which should better serve the community.
For new questions please post at magento.stackexchange.com, the community-run support site for the Magento community. We will be providing updates on the new forum solution soon. For questions or concerns please email firstname.lastname@example.org.
Take a look at Cart2Cart. This is shopping cart migration service which enables automated migration of products, customers, orders and other data from one shopping cart to different one. I am sure they supports shop-script to magento migration.