http://freelanceswitch.com/: This site has both horizontal and vertical navigation. The main navigation is at the top (going horizontally), and is in the gray box. The secondary navigation is within the green box below the main navigation, as well as off to the right side going vertically. The green box has a slight gradient and is given some texture to create a distinction between primary and secondary navigation.

http://www.apple.com/finalcutpro/: The site has mainly horizontal navigation. The primary navigation is at the top, with a gray texture added for distinction purposes. The secondary navigation is below the gray navigation box, and is also horizontal.

http://macrabbit.com/: This site uses only horizontal navigation. It is very simple in that it uses small icons along with text as links. The main navigation at the top is the only navigation throughout the site. All of the icons used have a similar artistic style to them, and when they are clicked they change color and are circled.

http://www.prague-guide.fr/: This site uses vertical navigation. The links are made to look like folder tabs and are given texture for distinction. On other pages, horizontal links are used with no special added texture. When the main tabs are clicked, they change color to show which page the user is on.

http://www.polkdesign.net/: This site utilizes horizontal navigation. The main navigation is flushed left and changes from black to red when hovered/clicked. Other pages use secondary vertical navigation (flushed right).

Four out of five of these sites use horizontal navigation as their primary navigation of choice. They also tend to use vertical navigation as their secondary. Their main navigations tend to be textured, whereas the secondary is not.