Ripten writes:
"According to an interview with Pete Hines from Rock, Paper, Shotgun; the PC version of Fallout 3 will not come with a mod kit out the gate, and while he doesn't rule one out in the future, it's as good as locked in a vault for now.
Hines said that producing the mod tools takes a helluva lotta time and effort, and that people have become to accustomed to having them in Bethesda games, but this time, no dice."