Somehow I doubt NBC has been able to copyright a phrase as universal as "That's what she said." Which means they won't be able to make any money now that Michael Scott's catchphrase on "The Office" is its very own iPhone app.
That's right -- when somebody sets you up with an inappropriate phrase like "I think we may have to approach from behind," you no longer have to say "That's what she said!" to generate a few easy laughs. Now you can take out your iPhone or iPod Touch, unlock it, and play a recording of somebody else saying, really emphatically, "That's what she said!" Hilarity (or is it confusion?) ensues.
Neither the website nor the iTunes page specifically mention "The Office." But really, while NBC and the writers of that show have no legal recourse for a pretty common phrase, they do have a right to be annoyed that somebody's building a little business off the catchphrase they popularized (though they're not making money yet -- the app is free) by turning it into an incredibly dumb little application.
As Gizmodo aptly put it, "You're an unfunny person if you say 'That's what she said!' all the time. You're an aggressively, offensively unfunny person if you pull out your iPhone and push a button to say it."