Winamp allows you to install plugins that can do various tasks for you The Now Playing plugin monitors the song you are listening to and publishes the data in various ways:

Creates a XML file with information on that song. A file called now_playing.xml is created in your Now Playing plugin directory. The plugin also offers you the ability to FTP/SFTP that file to a server of your choosing after its updated
Create a ping with the song information. Post information on Twitter.