Over at the Obsidian Blog, Chris Avellone has a great write up talking about the process of how they created audio and branching dialog options for their upcoming title, Alpha Protocol. 

Along they way, he discusses first drafts, getting talent, working out bugs through the QA process and so forth.  It was interesting to see the process that goes into making those great dialog trees that end up choosing our path throught the game environment. 

Head over to the Obsidian Blog to read the rather lengthy blog post for more details on how the process is put together.