WebReaper is web crawler or spider, which can work its way through a website, downloading pages, pictures and objects that it finds so that they can be viewed locally, without needing to be connected to the internet. The sites can be saved locally as a fully-browsable website which can be viewed with any browser (such as Internet Explorer, Netscape, Opera, etc), or they can be saved into the Internet Explorer cache and viewed using IE's offline mode as if the you'd surfed the sites 'by hand'.
http://www.webreaper.net/