Hopefully the above post provides a good summary of how you can easily use LINQ to SQL to update your database, and cleanly integrate validation and business logic with your data models.  I think you'll find that LINQ to SQL can dramatically improve your productivity when working with data, and enable you to write extremely clean object-oriented data access code.

In upcoming blog posts in this series I'll cover the new <asp:linqdatasource> control coming in .NET 3.5, and talk about how you can easily build data UI in ASP.NET that takes advantage of LINQ to SQL data models. I'll also cover some more specific LINQ to SQL programming concepts including optimistic concurrency, lazy and eager loading, table mapping inheritance, custom SQL/SPROC usage, and more.

Hope this helps,

Scott