Those kinds of tutorials would be great to have for newbies. I don't know how much it would help 'advertise' Linux though.
For most, if not all, of my non tech friends, a computer is just that, a computer. A tool. Some of my friends don't even know what a Macintosh is, much less Linux, and have a hard time understanding what they are.
They didn't know that Windows is a 'part' of the computer, not the whole thing. Most don't understand that the monitor, keyboard, and mouse, are separate things also. Also, for them a tablet, is a tablet, is a tablet. As long as they can A) afford it, B) it does what they want, it doesn't matter to them if it's an Android, Windows 8, or an iPad. Which, when it comes to tablets, isn't necessarily a bad thing, just an entirely different viewpoint.
They don't want to understand either. They just want it to work. Which is hard for us to comprehend.
Once they're interested in digging deeper... Well that's a different story entirely.