I was thinking about augmented reality technology such as Google Glass and also the Occulus Rift and I found this image.
Seriously though, what if we could create a Bitcoin glass/rift type device. It is possible to have custom tablets built now days so why not something similar(without breaching patents) to the tech mentioned. I can imagine simply scanning items and purchasing with Bitcoin stored in the device or on a network, bypassing checkouts, paying for transport, gas and so on. This would surely catapult Bitcoin into a mainstream technology.
Side note: If anyone decides they want to run with this then keep me in the loop, I specialize in branding, 3D, web design, etc so providing some techy's and investors are game this might be a worthwhile project.