Done with Terragen and Photoshop.
After someone spread it on the web as photograph of a "Sunset at the north pole", this image became quite popular.
It is of course not a photo and it does not show a place anywhere near the terrestrial north pole
Side note: the moon sets in that angle towards the horizon only close to the terrestrial equator. This is because Earth and Moon share the same plane of rotation around the sun.
Because of its viral spreading, the image became "Astronomy Picture Of The Day" at NASA website in June 2006:[link]
It still goes around (2011)