I can second this one. Having worked in the print journalism industry, I can testify - gee, that's not "original research", is it? - that double-spacing is no longer required save for some local courts which require submitted documents have the double-spacing after punctuation marks. The irony here is that they require it because they're using older scanners and OCR software, and this helps reduce scanning interpretation error, and the documents produced themselves are *stripped* of the extra space!