This is less of a request, and more of a need for some help finding an existing script.
I remember a while back I had a mod/tool/whatever it was that helped with building large things. Basically, it allowed me to duplicate stuff in a variety of ways. Instead of using the duplicator tool, I would be able to use this and select that I wanted, and then say, for example, something to the effect of I want 10 more of this box, along the x axis, and it would create them. It was great for making box forts, as I could lay our the bottom layer, select all the boxes, and then duplicate them up with a single command.
So, does anyone remember what the tool for this was? I've been racking my brain for the last hour trying to remember what the heck it was called.