The VideoEgg Advertising Network site uses vertical tabs along the right of the page with labels properly oriented in the north-south direction. While doing tabs this way requires that they be handled as images or Flash, the metaphor is recognizable and its use makes sense immediately. Local navigation is handled inside the banner area.

1. Vertical tabs along right side of page.
2. Navigation detail. Local navigation seen in the large banner area to the left of the tabs.

http://www.videoegg.com/