HTTrack is the best offline browser that I could find.

I tried webwhacker, leech, teleport pro and web copier.

TuCows should have given you 4 cows. I suggest a 
"recount."

Are you planning a paid version?
Here's a cnet.com link where its the third most popular 
download and has the highest user rating.

<http://aolcom.cnet.com/downloads/0,10151,0-10067-106-0>-
1-0,00.html

HTTrack 3.00RC6

Download a Web site to a local directory for offline 
browsing. OS: Windows 95/98/NT/2000
                                                   
Freeware 01/26/2001 92%up 256 votes 56,988 downloads 
popular 

Thanks
Daniel