"Pocket Stars SP Version 5 supports all Windows Mobile Smartphones from version 2003 through Windows Mobile 5. It adapts to all screen resolutions including VGA, QVGA, in landscape, portrait, and square orientations. The display can be set to fullscreen and customized for different color schemes. 3D solar system flythrough lets you view planets and stars from any location in the solar system. Time animation in units of months, weeks, days, hours, and minutes. Sloan Digital Sky Survey images can be displayed for a selected object at various zoom factors."
One of the very first applications I got for my first Pocket PC years ago was this one. It is one of my all time favorite applications. Even if you don't care about astronomy it is worth having it just to look at it and move around the night sky. You can watch it track the sky in real time or move and zoom about. There is a free trial and a lot of screen shots so head on over and have a look.
 [BlackJack]