gadget said:
I check inside the method to see if an invoke is required. If so have the delegate make a recursive call to the method, otherwise perform the action.

This is in vb but should be clear.

 Public Sub ReadKeyboard()
        If Me.InvokeRequired Then
            Dim x As Action = AddressOf ReadKeyboard
            Me.Invoke(x)
        Else
            me.Text = "Keyboard acquired"
        End If
 End Sub

Check out the invokerequired property of the control class.
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.invokerequired.aspx

This is a cross-cutting concern, no? I do this with the following extension methods:

public static void InvokeOnUIThread( this Control myControl, Action action );
public static void InvokeOnUIThread<T>( this Control myControl, Action<T> action, T parameter );

which would be used as follows:

this.InvokeOnUIThread( () => myControl.Text = "Keyboard acquired" );

Asked for feeback on this earlier...what do you guys think?