Does anyone develope on their touchscreen? Can you imagine Visual studio with a touchscreen Metro interface? I think someone summed this up pretty well already: "The Windows 8 Metro interface was designed for consuming information instead of getting serious work done."

Yes, rely heavily on sample tests to write some well known coding. If they can't handle that, they are nubs and will end up slowing you down getting them up to speed in the current project. I also give them a test to see if they understand the code and can pickup on a feature in a current project. I evaluate their creative contributions to a feature with some basic questions. Also I ask them to bring examples of programs they have written themselves. All worthwhile developers have their own little projects they are working on. I look for completeness in their work, idea's they have for improvement and how they would go about it. I also evaluate their eagerness to get started and ability to work with a team. I think these things are extremely important.