Hi GentleDepp and welcome,
We do this using our Database Accelerator Web Service. The InfoPath form submits to the Web Service which maps the data in the form (er, formular) to a SQL database. The Web Service also stores the data into SharePoint. You can read more about it here: http://www.qdabra.com/en/products/DBXL.aspx . We'd also be happy to show you a demo. We have a new Workflows Webinar coming up in a week. If you are interested in learning about SharePoint Workflows, Forms-based Workflows and how to integrate with Web Services, please send e-mail to CourseManager @ Qdabra.com to register for the class. Cost is just $75 for the 90 minute course.
Best regards,