> Is it possible to map a website copy?  That is, instead 
of 
> actually downloading the files, is it possible to just 
get 
> a list of the directory structure that would have been 
> created on my system?
Err, not really - you can grab all the html structure 
(which can be quite long) and analyze it - and attempt to 
analyze the downloaded code. 

You can also do a "regular" mirror, and exclude all non-
html files bigger than 1KB (that is, almost all non-html 
files):
-* +www.thesiteyouwanttobemapped.com/foobar/* -*[>1] 
+www.thesiteyouwanttobemapped.com/*.html 
+www.thesiteyouwanttobemapped.com/*.php

(example if you get html and php pages - you may use asp or 
cgi extension depending on your needs)