> keep in mind that most download accelerators don't 
exactly 
> speed up the maximum bandwidth of your connection (a 
common 
> belief). Apparently, what it does is split up downloading 
> into several streams, and make it work concurrently 
(which 
> speeds up the overall download process).

Right, but httrack also uses multiple connections - 
accelerators won't be efficient, or, worst, will slow down 
the download process, because they'll attemps to start 
unnecessary connections excluded by httrack.