Servo wrote: 
Source code source, of course, of course.

So what do they call the source code for this Source Code program?

You have exactly eight minutes to live, and you know you're going to die.
However, a computer program called "Source Code" brings you back to life, only to let you live for another eight minutes. Each successive eight minute "lifetime" is just long enough to let you try to solve a mystery: identify a terrorist who set off a dirty bomb that destroyed Chicago.
"You" are not really you, but a  vicarious incarnation of the dead person whose mind and body you inhabit, living their reality, courtesy of Source Code. Oh yeah, you happen to fall in love with the girlfriend of the "person" you become, and choose to spend an eternity with her.
Borrowing ideas from quantum theory and identity transformation, Source Code begs the question: what is reality, or, are we all a "brain in somebody's vat."
I thought this movie was one of the best sci-fi/mystery flicks I have seen in a long time.  Anyone catch this movie?  Anyone else like it?