See http://support.microsoft.com/?kbid=834427 for a tool that will remove
that and much other personal identification data from Office 2002/2003
documents. If you're using an older version, see the appropriate article:

How to Minimize Metadata in Word
WD97:
http://support.microsoft.com/?kbid=223790
WD2000:
http://support.microsoft.com/?kbid=237361

Couple of ways to do it.

1. The GUI method:
(steps listed are for Word 2002, other versions might be slightly different.  Heck, they might be drastically different.  Or non-existent.)

- Click on Tools -> Options...
- Flip to the Security Tab
- under Privacy options, check the "Remove personal information from file properties on save" checkkbox.
- click OK

That will remove _all_ the identifying information that you see in File -> Properties (none of the character counting, editing times, etc..., though).

2. The VBA method
(Doesn't seem to really work)

ActiveDocument.BuiltInDocumentProperties("Last author").Value = ""

I tried that, and the value appeared to change, but it didn't stick.  Dunno why.  Perhaps you or someone else could shine some light on this.

hth,

-Peter