Under windoze this is trivial. Click on index.htm and off it goes, running the locally stored website tree off the hard drive etc.
There seems to be no obvious way of doing that on IOS. One may be able to fetch a website (going through every possible link, however) and somehow retain the cache, but the browser will reload many/most pages when you do Back etc...
The Ipad is not (yet) jailbroken but I can access some app directories using Iphone Explorer. For example I can drag/drop files into Goodreader's Documents directory and that works great for loading PDFs to read later, without messing with Itunes.
So I need an app whose Documents dir is externally accessible and which is a web browser