Here's an article about the release of Rowan and Martin's Laugh-In on home video. There are stills and RealVideo clips, including the one of Richard Nixon saying, "Sock it to me???"
By the way: If anyone needs proof that Dan Rowan is dead, it's right there on the cover of the DVD. It says, "Produced and created by George Schlatter." I dunno who created the show but I know that if Rowan were alive and he saw that, he'd be chasing someone with a pickax.