Wow, Lucky you..I just made such a thing in Word 2003.

1. Decide first if you want to allow for multiple printer types - Laser
types can print up to a quarter inch from the page border, inkjets need a
wider margin.

2. Scan the logo into the computer at the size you want it to take up on the
page.  Set the resolution to at least 300dpi and save as a TIFF or BMP (NO
JPEGS!).  Make note of the picture size and where you want it placed.

3. Now go into Word and create a new document.  You want to make a document
template, so you need to decide if your logo/letterhead will be on every
page, first page only, or different logo on second + pages.

<<Section A:>>

1. If you want to have the logo on every page here is what to do:
2. Go to View >  Toolbars and select Drawing - you will need it to finish
the letterhead.
3. Go to View > Header and Footer.
4. When the header (or footer) is selected, go to Insert > Picture > From
File, and browse to the picture you scanned earlier and select it, then
click on the [Insert] button.
5. When the picture shows up, double click on it.  The Format Picture option
box pops up.
6. Click on the Layout tab.  Select the "Behind Text" option, then click on
the [Advanced...] button.  Click on the Picture Position Tab in the Advanced
Layout Popup
7. Set Horizontal and Vertical Alignment or Absolute Position relative to
page only.  Click on Lock anchor and make sure Move Object with Text is
unchecked.
Click [OK], then click [OK].  Select the repositioned picture.
8. Go to the Drawing Toolbar, Click on the [Draw] button > Align or
Distribute > Relative To Page.
9. Close the header and footer view.
10. Save the document as a template.

<<Section B:>>

If you want to get more elaborate and have a different first page, do the
steps 1-8 using your second page image.  Once done, or if there is no image,
do the following:

1. Go to File > Page Setup
2. Select the Layout tab
3. In the Headers and Footers section, click on the "Different First Page"
check box, then click "OK"
4. Do Steps 2-10 in Section A.

Special thanks to Suzanne Barnhill for her earlier assistance.

Hope this Helps.

Mike

So you want corporate reports or pleadings or contracts on your letterhead?
How about labels? You do not want all of your  documents on your letterhead,
I'm sure. What you do want is a custom document template.

Unless your existing letterhead has a graphic you would be better off
reproducing it in Word rather than using a scanned image. If there is a
graphic, scan the graphic and reproduce the text. It will be sharper and the
files will be a lot smaller.

Thanks. It is real work of a genius!