Here's a short article from INC magazine from 1996 about a woman who ran her publishing business from a single bound notebook:
http://www.inc.com/magazine/19960901/1807_Printer_Friendly.html

And just to plunder from my bottomless bag o' bookmarks a bit more on the single journal topic:

The Advantages of Keeping an Analog Work Journal | D*I*Y Planner
http://www.diyplanner.com/node/4534
As you can see from the title, this is more about keeping a worklog. But interesting, nonetheless.