PrimeFaces gets a new component; MegaMenu. We have been getting feature requests from the community regarding this and decided to implement this after finding out what a megamenu is by looking at this link.
One nice feature of MegaMenu is the custom content support, in addition to regular submenus and menuitems, you can also place any content inside the MegaMenu. So after working on this for a day, tadaaa;
Check out PrimeFaces 3.2 Labs to see MegaMenu Beta in action!