Problem with non-linearity is that its a beotch to test, multiple paths or story trees are the way to go. I'm hoping that Deus Ex 2 goes to town on this!
"The key to immortality is first living a life worth remembering - Bruce Lee"
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B: Pinky, are you pondering what I'm pondering?
P: I think so, Brain, but where are we going to find a duck and a hose at this hour?