1) It works with IE8. It seems to use a Flash player wrapper to play the mp4 video.
2) It supports subtitles and captions in different languages.
3) It's simple to use. You can get started with just a few lines of code.
4) I found Firefox doesn't support mp4, but ogg files will work.
5) It works in mobile devices without any support.
6) It's open source
