Site scraping and data mining

We need a PHP or Python script that runs on a linux server. - Script will poll the main page of a web site, get sub-page links from it and then scrape those sub-pages for data - Script that parses the sub-pages should be able to run asynchronously and concurrently with other instances of itself. - Upon parsing data, it will be added to a MySQL database. Script should be able to run over multiple VPN connections as an option.