FWIW, the curious can see some of the work we did on the Linux Plumbers Conference site. Not perfect, but it did make the site a lot more workable for mobile users.
I would love to find a way to upstream some of this work. It was done with a hatchet and isn't in any way suitable for more general use now. If there were an Indico-capable developer who wanted to work on some of this stuff, I think that funding could be found to cover it.