Looking back to my BDD experience, I remember that once we did massive refactoring (actually, it was rewrite process) having only BDD specs on hands (it was routing subsystem with access rights subsystem taken into account).
As the result we were able to rewrite 'from scratch' functionality with those specs with now problems.
Now I see that this experience can be spread to the most of well-developed problem areas: we can describe the most functionality via BDD specs, and share them.
Having such specs on hand, it is possible to write own implementation on different languages.
I will think this idea over :)
