I'm looking for the Gabriel Knight dialog style

[Guyper]

The one where you see 2 faces talking to each other on a black background, where can I find it?

[GarageGothic]

Dorcan made a really nice approximation of it (the text isn't displayed beside the characters as in GK, but we're waiting for CJ to implement custom text boxes to do that). You can find it at http://www.digitalmindstudio.ch/script.php?langue=en&id=2&page=

You can download the source code from a link in the sidebar