We presume that Nokia's debut of their Windows Phone device will happen in October, but their Windows phone efforts have already been stepped up, as their first application appears in the store. It's called "Top Apps" and while visible in the Zune Marketplace on your desktop, it's not yet available on Windows Phone handsets (reports WP Central). The assumption has to be that these are Mango based applications, and are going to be available only to Nokia's Windows Phone devices, at least in the first instance.

Nokia have previously said they would contribute to the app ecosystem, so we'd expect Top Apps to be available for other handsets in short order - assuming it's a curated list of applications along the same idea as their "Ovi Daily App" for Symbian, it should be a wonderful discovery tool for everyone, and help to promote Nokia's use of Windows Phone to the consumers at the same time.