Customizing your WordPress navigation bar is incredibly easy to do with Headway. This video covers step-by-step how to do the following customizations:
Change the order of navigation links
Position the menu on the left or right
How to create sub-page links
Position the menu above or below the header
Customize the color, font, size, kern and line-height of navigation links
Edit the link targets of each navigation link
Visit Headway Themes to learn more about why it kicks ass!