sitemeter: If you scroll down to the bottom of the page you'll see a sitemeter icon. My guess would be that it's for monitoring WC traffic.
intelletext: intellitext is the little paid links that show up when you hover your mouse over a particular word or phrase. This is only seen if you do not have a WC or ODNT subscription.
gamezone: not sure, but Stardock also develops several games, so it may be a link of some kind to one of their gaming sites.