Just because the Zune HD Marketplace isn’t open like the App Store doesn’t mean that developers can’t make apps for it and we can’t use them. A developer has created a multi-touch drawing app for the Zune HD using XNA 3.1 Zune extensions. The app is really basic and doesn’t even have different colors to chose. But the developer has already said that the app is intended for developers and encourages improvements to the code.