I've done very little graphic data configuration and drag-n-drop stuff in VS2003, but I'm getting a hang of it in VS2005 and Winforms. I just mentioned I am primarily using Custom DataSets in a Smart Client data model. One thing I failed to mention is the improvements in ADO.NET 2.0 in working with DataSets. Here's a quick XML schema of a custom DataSet (one of several views), with the ability to model and define relationships, constraints, keys, and so on. Very sweet. Below the screenshot is a quick code excerpt on populating a dataset consisting of two tables in ADO.NET 2.0. Not a lot of code is required to get the job done!
public MyDataSet GetMyDataSet()
{
MyDataSet myDataSet = new MyDataSet();
MyDataSetTableAdapters.daProjects daprojects = new MyDataSetTableAdapters.daProjects();
daprojects.Fill(myDataSet.dtProjects, "20"); // "20" is a parameter to a Stored Procedure
MyDataSetTableAdapters.daUsers dausers = new MyDataSetTableAdapters.daUsers();
dausers.Fill(myDataSet.dtUsers);
return myDataSet;
}