A Japanese company has come up with a gizmo called a Tele Scouter / テレスカウター which can translate what people say to you in foreign languages and display the results via a retinal display attached to your glasses.
The Tele Scouter is a small gadget that fixes onto glasses which incorporates a retinal display, a camera and a microphone. The microphone picks up the language and transmits it to a small computer worn around the waist, which sends it to a server for translation. The translation is then displayed on the retina. The device cannot currently keep up with language spoken at normal speed, and is a bit bulky, but it’s an interesting development.
If the size can be reduced and the speed and reliability increase, this device could be really useful. If it could also translate and/or transliterate written language, if would be even more useful, especially in for languages written with different writing systems.