Kevin: Quick response (QR) bar code was originally created by Japanese company Denso-Wave to keep inventory. They are the square codes often seen on products, but as the post says, because they can store more data than the 10-digit bar code they are popping up in a number of interesting applications. Here are five interesting ones, including a Pet Shop Boys protest against an ID card scheme in the UK.

Kevin: Brady Forrest at O'Reilly goes through the impact on location-based services of the 2009 iPhone 3GS. Platial and Pelago have some tough thinking ahead about what their business model will be. But the iPhone 3GS open up some real opportunities in terms of augmented reality and real-time location updates. There are still some things that need doing. Safari has no access to the camera. Apps can only send data if they are open. Apps can't send data if they are in the background.

Kevin: It's another good guide on how journalists can use Twitter, but it's good and comprehensive, exactly what you'd expect on Mashable.

Kevin: Jeff Jarvis says that members of the union at the Boston Globe shouldn't have rejected the package of pay and benefit cuts that parent company New York Times is offering but rather reject the strategy they have put forward. Jeff says: "The Guild should have demanded a strategy that transforms the Globe into a smaller but profitable venture that concentrates only on news and serving the community and not on printing and distribution, jettisoning huge costs but coming out with a sustainable plan."