A while ago now, I created English subtitles for Gabriel Knight 2, the only game in the series that lacks subtitles.

Since I don't know anything about programming etc, I used a pre-existing patch created by a guy called 'kelmer' which introduced Spanish subtitles to the game. What I did was remove the Spanish lines and replace them with English lines I got from watching the game videos and writing down what was being said. This means there might be some errors here and there, but I think it's pretty good overall.

And now, a guy called 'Collector' from some cool GK forums has created a very nice installer for the patch. It now works for both the Windows and DOS versions (used to only work for the Windows version).
It now also supports the deinterlacing patch (included in the installer he created).

You can get it here -
http://www.sierrahelp.com/Games/GabrielKnight … 2Subtitles.html

Here is what it looks like (ignore the thing about only working in the Windows version, that was before he created this installer.. I'll fix it using annotations later) -

http://www.youtube.com/watch?v=tNv_Be6hoLg

Was a lot of work but I think it was worth it... pretty happy with the results overall.