This reminds me of the rarely-used print stylesheet[0]. In fact, the only place I've ever seen it in use is on websites run by the Dutch government (perhaps other governments do so too, but I've never needed to check them out).

EDIT: A bit of online searching mainly shows people *complaining8 about print sheets, so perhaps I'm completely out of the loop and simply haven't printed anything in a long time.

It's not much - just stripping out menu bars and other stuff that makes no sense in print, plus a few typographical changes, such as a change in font from sans serif (screen) to serif (paper).

Similar to the other comment, there isn't a clear business case for it very often, but whenever there's a website with a "print version"-link to their articles I don't see why they wouldn't do this instead. Well, aside from the fact that nobody would expect this functionality to be there, which isn't minor I guess.

[0] http://alistapart.com/article/goingtoprint