Menus are being added to the WDW website. They're not there yet for every restaurant, but when they do appear, they're on the dedicated page for each restaurant (there is no central place for them). As an example, there are menus on the page for the Whispering Canyon Cafe, found
HERE. Look at the bottom right of this page, and you'll see links to the menus for breakfast, lunch, dinner, and dessert. The menus on the site are nice, because you can see the actual menu that you're given at the restaurant. However, there is one glaring problem with the menus on the WDW site -- they don't give you the children's menu.
With the one exception of Victoria & Alberts, EVERY table service restaurant at WDW has some sort of menu for kids. These menus are given to children in the restaurant on a coloring page. While the menu remains constant, the coloring pages change with some regularity. I'm guessing that this why there are no kids' meal PDFs on the Disney site. I hope that Disney plans to add access to the children's menus to their own website, but in the meantime you can still go to allears.net to get the kids' meal information.