As usual, nothing on cross-browser compatibility (respond.js, modernizr...), nothing on speed optimisation (a real problem in RWD), on backends issues (regarding the multiples images needed), etc...

It often strikes me, reading these tutorials about RWD, than the authors know all very well the theory but have never done a real (ie for a client) responsive website in their life.

It's all generic and general stuff, never how a stupid menu can be a real bother when you have to support two different states, touch and mouse, users without javascript, changing states, IE9 with no CSS3 transition support, etc.

Tutorials show you the easy way, the way which works only for cable users with a fancy Macbook and the last Safari or 4G iPhone users.

In real RWD, what should be easy becomes hard, and nobody'll tell you that.

(btw, i'm not a RWD hater. I just want to warn about its realities.)