Some people on this thread seem to be implying that an intersection takeoff is akin to negligence or poor airmanship.
I get tired of this old chestnut as well. All very true if you are in your 185 trying to get out of a jungle strip but hardly applicable to airline ops.
To use an extreme example: imagine the runway is fifty miles long. Is it safe to use the intersection halfway down? That would leave twenty five miles. But what about using the runway behind you? Obviously that would be a stupid waste of time and fuel. So in this case all of sane disposition would agree that an intersection departure is appropriate. Now that I have you all in my net, lets start reducing the size of the runway. At some length it will become inappropriate to do an intersection departure. This point will be subjective but for those of us who fly commercially it will be
at least a length calculated to provide an adequate margin of safety.
This has nothing to do with the original thread by the way.