The MassDataHandler is a framework to assist with Database Unit Testing. The framework makes it very easy to insert test data into a database, which in turn makes it very easy to write database unit tests. The user merely needs to specify their relevant data in a simple XML fragment, and then the framework uses knowledge of the database schema to do all the grunt work and convert that XML data into SQL, from which it populates the database.
We recently improved the install process for the app by having a GUI form collect environmental info for SQL 2005, MSTest, and MSBuild. The install script uses the concept of Having an MSBuild script collect userinput.
If you're looking to test your data layer, check out this free tool. It's now easier to install.