> If you aren't concerned about the structure of the
> mirror, you could have a look at using a non
>-default 'Site Structure' (Options > Build), maybe
> something like 'Html in web/, images/other in web/images/'

In fact, no, httrack is too clever for that :)

The engine will detect collisions between www/foo.html and 
www.intranet.com/foo.html, and will fix them by renaming 
www.intranet.com/foo.html into www.intranet.com/foo-2.html. 
The naming system allow to use any name, handling 
collisions transparently during the naming phase.