Saving paper when printing a large document: use your printer's "multiple pages to a side" feature. Many printers can do it!
Have you ever needed to print a very large document (or a set of them)? Are you aware that your average desktop printer (or of course, a commercial printer like Kinko's) can be told to print multiple pages to a side? And/or 2-sided? It's something I do even for printing anything more than 1 page, but I'm surprised how often I see people just leaving the default of printing to a single side per page.
I'm finding that more and more printers (laser and inkjet, and of course those in a printshop) can be told to configure the printing to do multiple pages to a side. If yours does, it may be found when you do File>Print, and then choose either Preferences or perhaps Properties. The configuration steps are quite different for different printers, but do check it out.
So, for instance, if you print something 2 pages to a side, that would of course cut your printing in half.
So would printing it 2-sided, of course, which you'd naturally think to do at a professional printer. But many laser printers can do that also, in that same setting area. Some do it automatically (if they have a built-in duplexing engine that flips pages over while printing), or they may at least offer it as a manual option, where it prints out the pages with the content on one side, and then you are directed to feed the stack back in so it can print on the other side. That manual process is a lot more tedious, but may be worth it for a large document.
Finally, best of all, if you've got good eyes/glasses/contacts and can take the relatively small printing, you can try printing even 4 pages to a side. That would cut the printing in half again. I do that all the time, so at 4 pages to a side, 2-sided, I can print a 100 page document in 13 pieces of paper! For a 3000 page document set, that would cut it down to 375 pages, enough to fit in a single binder or binding. :-)
Hope that's helpful.
Some extra notes regarding such printing
Here are a few other points related to the idea of printing multiple sides to a page, in terms of when it works best, why it's better than using Powerpoint's "print handouts", and how to configure your printer to default to this sort of setting.
First, I should note that in some documents the fonts they've chosen are really too small or faint, so run a test first. But honestly, most documents I print are just fine. Even at 4 pages to a side, I find that for most pages the text size is still no smaller than the text in some ads, etc. And the savings in paper (and time) is so worth it. Of course, the savings in ink is also substantial, as you're still using about the same amount of ink as a single-sided page since the text in that case is bigger!
Second, another place where this tip helps is in printing Powerpoint slides. Sure, there's an option in Powerpoint to "print handouts" and that offers options like 4 slides to a page, but in my experience that has made the slides a fixed size (whether 4 or 6 to a side) so there too small to read and also leave unused whitespace. Instead, if I print using the printer's option for 4 pages to a side (and just tell Powerpoint to print "slides"--the normal setting), then the slide is bigger and leaves less wasted whitespace.
A third tip, when printing multiple pages to a side in duplex mode, is to pay attention to the setting for flip "on top edge" or "flip on left edge". Otherwise you may find yourself needing to flip the back page over (upside down) when you turn the page. Just take my word for it to pay attention, and consider these options to control it if it happens to you. :-)
Finally, note that you can also configure the settings for your printer so that it always defaults to being whatever page-per-side or duplex setting you desire. In Windows XP, for instance, choose Start>Printers and Faxes, then select your printer, then right-click it and choose "printing preferences". Set your desired settings, and now whenever you print a document, it will default to this setting (which you can of course change for a given printout, if desired). In fact, some printers also let you save settings as sets under different names, so you can then choose (at each printing) if you want 1-sided (for tax forms, for instance), 2-sided, 2x2, 2x4, etc.