Just checked it out on my tablet (iPad) - I don't see much of a difference (of course, it's responsive!) except for the menu, which works pretty well :)

Minor points:

- When in "mobile mode", the search box changes colour so it doesn't look like a text input any more. I'm not sure if that's a good idea.

- I agree with the others on this one again: the gradients and the shadows are a bit excessive. Maybe you could try a "flat" shadow instead? (ie. a shadow with a 0 blur radius)

- I really loved the old docs search mechanism where the site had a local index of keywords and could search without hitting the server. I hope you don't lose that.

- I'm not sure what the concept of the two navigation bars is. What is the top bar for, and what's the second bar for? I see "Documentation" in two places. Logically speaking, I'd expect the upper bar to be the primary navigation, and the lower bar to be the secondary navigation, but clearly, that isn't the case.

Anyway, is this open source as of now? Where can I contribute?