Thanks for the reply!  I tried this like you said, but when I started the
mirror, the spider began following all the robots.txt rules even though I have
set the -s0 argument.  (The intranet site is an offline copy of our live
website so the same robots.txt exists in both).

I had to add a special rule to the robots.txt file:

User-agent: httrack
Disallow:

So it would again start mirroring eveything.  Once the mirror completed, I
found that the same thing had happened.  about 10% of files at random were
overwritten with the 416 HTML message.

How can I disable these "2nd requests" and prevent these files from being
overwritten? :|

Brian