•  http://trac.annodex.net/wiki/CmmlSubtitlesOverview
•  Which is the most commonly used subtitle format?
•  http://divxstation.com/article.asp?aId=27
•  http://en.wikipedia.org/wiki/Category:Subtitle_file_formats
•  http://wiki.multimedia.cx/index.php?title=Category:Subtitle_Formats