from the help files in word 2003
Prevent a document from printing onto an additional page
Using the following method works best with short documents, such as letters and memos, that only have a small amount of text on the last page.
On the File menu, click Print Preview.
Click Shrink to Fit .
Note In order to shrink the document, Microsoft Word decreases the font size of each font used in the document. You can undo a Shrink to Fit operation by clicking Undo Shrink to Fit on the Edit menu. However, after you save the document and close it, there is no quick way to restore the original font size.
also
Scale a document to fit on different paper sizes
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Just as many photocopy machines have a reduce/enlarge feature, Microsoft Word offers different ways to scale a document for printing, enabling you to avoid adjusting margins (margin: The blank space outside the printing area on a page.) or line breaks.
Note When you scale a document for printing, the changes only occur when you print. Word does not change the settings in the document itself.
On the File menu, click Print.
Under Zoom, click the option you want in the Scale to paper size box.
For example, you can specify that a B4-size document prints on A4-size paper.
Tip
This procedure scales your document for this printing session only. To scale your documents this way for all printing sessions, click Options on the Tools menu, and then click the Print tab. Select the Allow A4/Letter paper resizing check box.