Even though it's not really the "GINA" any more, here at our company we still call it that for shorthand.

I find it odd that Microsoft doesn't provide a true Kiosk mode. You'd think that would be something they'd want to make available.

If you decide to make your Kiosks run on an older OS that supports it, here's some articles on how to customize the GINA:
http://msdn.microsoft.com/en-us/magazine/cc163803.aspx
http://msdn.microsoft.com/en-us/magazine/cc163786.aspx