Out of the Box, Microsoft Office SharePoint Server provides you with the ability to read data using Business Data Catalog. At BDC Metaman we have been working on a solution that will allow you to update the data in your backend systems as well as read it. BDC Metaman will help you create your Application Definition Files without writing a line of code, and now allows you to generate and deploy web parts to SharePoint that updates your backend data as well, still without writing any code.
If you are new to BDC, then have a read of my white paper introducing BDC which is available for free download from our Lightning Tools home page or on my other blog.