There are times when you want to save a website, as it is. Maybe you’re going to be disconnected for a while, and want to browse through the content on a really long flight. Whatever the reason, it’s not as simple as just hitting “Save As” in your browser. That might get you a single page, but not the rest of them. For that you’ll need a special piece of software.
HTTrack is a piece of freeware that allows you to download entire websites to your computer. It will recursively build all directories and grab all of the necessary image files. This way when you sit down to browse the site, you will be able to click on every link (unless it leads to a different website entirely) and read it as if you were online. If you do a lot of offline browsing, this might be worth looking into.