Even notice the difference between a top menu and side menu on some sites? If the home page fits in the screen without scrolling, the side menu may not matter as much. But when side menus have a few buttons, and the page is long, there is often a blank field under the menu buttons all the way down. When the menu is horizontal across the top, the page content can fill all the area from side to side. I've used both positions for menus, but stuck with text menu links across the top since most of my pages have a lot of text.