I recently submitted an article about Nullable Data Readers .NET 2.0 for review which was posted here:
http://www.codeproject.com/csharp/NullableReaders.asp
As a quick supplemental example for that article, suppose you have a non-nullable type in your business object that you're populating with from a nullable field in the database (this might also happen when populated from an outer join). This is a good opportunity to use the new nullable coalesce operator (aka, conditional assignmenet) in C# 2.0 like this:
someObject.IsActive = dr.GetNullableBoolean(”IsActive”) ?? false;