Sure, The Weather Channel could take the conventional route and advertise their applications through their website and announcements on TV, but they've opted for a different approach.  Seen during a live television broadcast recently, the company is using Google QR codes in their regular programming to promote the app.  Scanning the QR code doesn't do anything more than take you to the webpage to download the application, but it's a smart marketing tactic, and one of the few mainstream places I've seen it used to date.

Via Engadget