Hello, let me first say that my initial impressions of HTTrack are positive. 
It seems to fill a void that wget not.  Thanks!

I've searched without luck to find a solution to specifying a particular
output structure.  What I need is to be able to include part of the url for
each file that is written.  That is:

<http://www.domain.com/foo?page=1>
<http://www.domain.com/foo?page=2>

would need to produce two files named

foo_1.html
foo_2.html

It does not need to be a completely custom reg ex of the url.  The entire url
as the file name (necessary character substitutions aside, would be perfectly
acceptable.