Well, what I /wanted/ to do turned out messier than I planned, since the
solution I was thinking of applies mainly to an "I'll show/bind anything"
control I have locally, but how about the following C# 3 solution (the main
bit being the anonymous type/array, marked "KEY BIT")?

Marc

static class Program {
   static void Main() {
       // our demo object
       Foo foo = new Foo();

       Application.EnableVisualStyles();
       using (Form form = new Form {
           Controls = {
               new CheckBox {
                   Dock = DockStyle.Top,
                   DataBindings = {
                       { "Checked", foo, "Bar", false,
DataSourceUpdateMode.OnPropertyChanged }
                   }
               },
               new ComboBox {
                   Dock = DockStyle.Top,
                   DropDownStyle = ComboBoxStyle.DropDownList,
                   // *** START KEY BIT
                   ValueMember = "Value",
                   DisplayMember = "Text",
                   DataSource = new[] {
                       new {Text="Yes", Value=true},
                       new {Text="No", Value=false}
                   },
                   DataBindings = {
                       {"SelectedValue", foo, "Bar",false,
DataSourceUpdateMode.OnPropertyChanged}
                   }
                   // *** END KEY BIT
               }
           }

       }) {
           foo.PropertyChanged += delegate {
               form.Text = string.Format("Bar={0}", foo.Bar);
           };

           Application.Run(form);
       }
   }
}
public class Foo : INotifyPropertyChanged {
   private bool bar;
   public bool Bar {
       get { return bar; }
       set {UpdateField(ref bar, value, "Bar");}
   }
   protected void UpdateField<T>(ref T field, T value, string propertyName)
{
       // general purpose "if changed, update field and notify" method
       if (!EqualityComparer<T>.Default.Equals(field, value)) {
           field = value;
           if (PropertyChanged != null) PropertyChanged(this, new
PropertyChangedEventArgs(propertyName));
       }
   }
   public event PropertyChangedEventHandler PropertyChanged;
}