If you prefer to read on paper, Snow Leopard’s Print sheet will help you save many trees:
What’s so nice about the new sheet, one may ask.
If you’ve ever tried to print multiple logical pages on each physical page, you know how tedious it can be. Often, what starts out as an attempt to save paper ends up being more wasteful through the trial-and-error to find that perfect scale factor. Snow Leopard now automatically optimizes the scaling factor on a per-page basis for n-UP printing. Also introduced is a nice little touch, where the total number of pages are re-calculated as you toggle Two-Sided, n-UP, etc.