Here is my list of other topics I have thought of for other articles on working with SQL Server in .Net
Data sets and representation of relationships and constraints in .Net code (The first draft of this article is almost ready for submission.)
Data types and what they convert to when you query SQL Server from .Net
Different ways of doing the data conversion
Techniques for converting data for display etc.
Dealing with nulls in data
How to avoid SQL injection in your .Net web app
Connecting LINQ to SQL Server
Dealing with concurrency
Catching data exceptions
Working with Schemas in .Net
I am interested in hearing any other ideas, and also the issues that might be helpful for developers (or DBAs) working with SQL Server data in .Net to know about.