I
There is any free software from which we can download whole site & we can operate full site offline. 
Internet
Offline explorer is good I tried the trial version long back.I think it was given in the digit cd long back.
If you have Download Studio, you can comfortably save the whole site onto your computer & view it offline. You can get it from
*www.conceiva.com/products/downloadstudio/default.asp
But its not a freeware.
*www.conceiva.com/products/downloadstudio/default.asp
But its not a freeware.