I have a language learning site[1] which started out as text translation, but I'm also experimenting with videos, the idea being it's helpful to see captions in both languages simultaneously as the video plays.

Examples here[2], here[3], and here[4].

[1] http://www.macaronics.com/

[2] http://www.macaronics.com/article/6e9812608f0b4dcdba8cfab3e6...

[3] http://www.macaronics.com/article/9540f24d080241dd9b27f7939c...

[4] http://www.macaronics.com/article/a6ab2c3d8c364ad38401d6dba3...