Alan Wake (fantastically entertaining game) is one of the more conspicuous about in-game advertising. Hell, they even work products into the gameplay itself. Penny Arcade's take on this is only slightly exaggerated, if you can believe it.
But does it make you actually want to switch to Verizon or use Energizer batteries? For me, yes and no. The phone cuts out too often in the game at inopportune times to be a good sales pitch, but those batteries sure are handy at violating the laws of physics. (Flashlights don't recharge themselves!) [Penny Arcade]