With the thought of putting my foot in the water to better understand the Windows 8 App Store App story (aka Metro), I published my first app to the store not too long ago. It only took two submissions! Just an FYI, when you enter the URL for your website, the certification process actually validates that the site exists. I don't have a site or even a dedicated page for the app yet, so I made a URL up. It failed validation because the URL didn't really exist. So on the second pass, I referenced one of my websites, even though I don't mention the app anywhere on it; and it passed validation.