What is a good horizontal menu design for a lot of categories?

Is there a good horizontal menu design to dis开发者_JAVA技巧play many categories and sub categories? If so can you give or point me to an example?

have you had a look into "Mega Menus"? there is a good tutorial at http://net.tutsplus.com/tutorials/html-css-techniques/how-to-build-a-kick-butt-css3-mega-drop-down-menu/ which tells you how to do it (or just copy&paste the existing code).