QR codes are gaining traction. Here are some examples of recent ads featuring QR codes:  

QR Invasion: Click Here

Video of the World's Largest QR Code: Click Here

Friends Around Town: Click Here

Free Cooking Videos from Wegmans: Click Here

Your Boarding Pass is Ringing: Click Here

QR Code Campaign in Union Station: Click Here

Sporting Goods with Overwhelming Strength: Click Here

A Closer Look: Click Here

Quilted Northern QR Code: Click Here

JFK Library: Click Here

Esquire: What Augmented Reality is: Click Here

Esquire video: Click Here

This company advertises in WIRED Magazine using Qr codes.

“Wake Up to the World of Inception”  
Discover the secrets of mind crime with Verizon Wireless’ QR code.

“Getting it Right”
This SPX QR code helps keep the mobile world moving.

 “We’re all in”
Microsoft promotes their clouding services with a QR code.

“Say the Word”
Your words are the DJ. The SYNC QR code sends users on a personal tour.

Deliver Magazine writes about QR codes adding interactivity to direct mail:
 
“Mix Your Media”
Deliver Magazine
July 2010

WinSpin CIC postcards invite users to spot trends and leap ahead:

Invigorate Your Brand, Your Team, and Your Vision
WinSpin CIC

QR codes are the topic of the day on Hickok Cole Architects' intranet:
Hickok Cole's introduction to QR codes