[WetWired]

vb.org does this by making a category forum for each tab except the forums tab, and setting their display order to 0 so they don't show on the main list (which is accessed by the forum tab). Then, they edit their navbar or header template to add the tabs themselves, which link to the hidden forums. Adding tabs themselves isn't too hard, they're just images with text centered over them. The highlighting part is the only part that would need a plugin, but I don't see the highlighting as very important, myself.