I have read in different blogs and comments such as yours Ross, that say that a QR code is pointless when it links to the same website/location as is already visible on the same page. I disagree. I think that the majority of people in the UK havn't yet seen a QR code being used on a business card, and this includes potential customers = +1 for originality in their eyes.
You need to understand the psychological effect that a QR code will have on a potential customer when giving the business card to the customer. When someone who is not used to seeing something such as a QR code they will be more intrigued by such a detail as they have never seen them before used in this way, nor will they have seen it frequently. If you show them your business card that has the QR code they will have to assume that you have a certain amount of knowledge to the area and are up to date with technology. Don't get me wrong, i'm not naive about it either. I'm aware that lots will not give a hoot about it and it will pass by, or they will think 'another cheesy QR code plonked unecesserally' however I do strongly believe that is not the thought process of the majority of people with exceptions to people who are knowledgeable in the areas such as us, graphic designers. So this too is = +1 for impressing client with technology.
Finally I think there is a level of interactivity that would not be there if there was only text. I have only recently purchased both ipod touch and a Galaxy S2 smart phone, both of which have the QR reader apps. Nearly every time I see a QR code (cereal box's, news papers, youtube videos etc) I feel tempted to scan and see what lies behind, something I pesonally never felt when seeing a simple website link
www.site.com. It's almost targeting an elite audience which might feel supreme because they feel they can access this QR code that maybe not everyone can. Of course, I know people are not like me, however again, I think that there is a higher chance of that QR being scanned than someone manually typing my site URL on a comuter. This too has a +1 for interactivity.
Remember I designed the business card for potential clients, not designers and the choice of the QR code being in that corner is most definitely not pointless
