i've found a freeware search/replace utility for *.txt, 
*.html, simple to use.
it allows use of operators, replace(erase) anything 
between two strings you specify, you can setup a list 
of operations to perform, can also specify a backup 
file for each file processed...
you can find BK Replacem at 
<http://www.orbit.org/replace/>

It´s easy to get hts-log(a copy,of course!) nearly 
clean of urls or messages i am not interested in and 
replace www for <http://www>, then i convert this 
modified hts-log.txt into html with text2html(at 
www.cyber-matrix.com/txt2htm.htm) and with 
linkchecker(at www.mihov.com) grab urls, inside this 
html, in a txt.
This txt is just ready to past on httrack web 
adresses(get separated files option)
Linkchecker doesn't handle html files of big size so 
you'll have to put its content on several ones.