RealPlayer

RealPlayer is one of the most popular free downloads for playing and organizing music and videos.  The latest version which is free has many other options.  It allows you to convert audio and video files to different formats.  One of the greatest new features is it allows you to download videos from the Internet like YouTube with one click.  Then you can convert it to whatever format you need it.  You can also clip files and just use the segment that you need.  Even if you use iTunes for your music playback consider using this for easily downloading videos from the Internet.  http://www.real.com/