> Has anyone here had experience with Zylox's Offline 
> Commander and/or Internet Researcher?  How do they
> compare?
Well, I really can't say anything about that, because:
- I never used this product
- I am the author of httrack and I can not decently make 
comparisons objectively

You can read various articles on the Net, such as:
<http://www.usatoday.com/tech/2002/04/26/offline-browsers.htm>

(well, this article is quite positive for httrack ; anyway 
this is the first one I found using google typing 
winHTTrack "Offline Commander" so I am totally 
objective :) )

> June 11th I contacted them about it.  
Obviously 'priority' 
> support does not mean next-day service, since I'm still 
> awaiting a reply or at least an acknowledgment that they 
> got my e-mail.

Well, I don't think this is related to the software, but 
related to most (not all - I say most) commercial 
softwares: you have poor support and updates compared 
to "free" softwares (and it is a bit funny to read comments 
on open source from IT managers that says that open 
source "lacks support" ..)

Anyway httrack has defects and bugs (like many other 
tools), but I'm always ready to look at them (well, except 
when it is way too hard to fix them :) )