For the past couple of years, mega-menus have become a trend in web design, in particular of e-commerce or news websites. If done well, this type of navigation can work extremely good by giving a quick access to information located deep in the website.
The best mega fly-out menus will usually be easily scannable, use segmentation or have images included. They should also keep everything visible on the page. One image being worth a thousand words, take a look at these 15 good examples of mega drop-down navigation menus.