Security Patterns and Practices - ADO.NET 2.0
The Patterns and Practices team have come out with new guidance and best practices surrounding ADO.NET 2.0.
A great synopsis of all things most folks already know - but some new and interesting content around partial trust apps, and signing your database code.
This team has also created a WIKI out on Channel9 that allows you to provide feedback on any of their best practices, and be a part of the secure developer community.