In VS 2005, the form is no longer COM-Visible by default. This prevents it from being set as the object for scripting. To allow scripting to target the form, do the following:

1. In VS select "Project" from the main menu
2. Select "<YourAppName> Properties..."
3. Select the "Application" tab
4. Click the "Assembly Information..." button
5. Check the "Make assembly COM-Visible" checkbox