mPlayer is an open source media player that allows you to watch videos and listen to music on your Windows Mobile device.
Although it's a stripped-down version of the original Linux version, mPlayer still represents a great way to enjoy music and video on your handheld. One of the best things about the program is its support for a varied array of different media formats. As well as the ubiquitous handling of MP3, AVI, WMA and the like, mPlayer lets you tune in to streaming media and recognizes all types of Flash video.
In terms of its user interface, mPlayer is a little simplistic, though not in a bad way. In fact, I much prefer to have a player that's light yet practical, rather than some bloated app with loads of features you don't need. Hence, you get basic options for locating a file, opening a playlist or adding a URL, without impacting on your device's memory too much.
If you're looking for a slick and simple way to handle all types of media on your Smartphone then look no further than mPlayer.