I've just seen this article at Tutsplus that promotes putting navigation after content to cater for (or should that be pander to?) mobiles.
As you can imagine, the author has used absolute position to show the menu on larger screens, breaking the source/display order relationship, which doesn't feel right at all. Even if the tab order is altered to start with the menu anchors, it just seems like reducing accessibility for the sake of another group of users.
But I would really like to know what other people think before I write off this idea completely. Is this sort of thing ever OK to do, and is this the kind of thing that we are going to see more of, and need to do, now that everyone wants the web to work well on their phones? I would be quite happy to do this if any drawbacks that it may have are small enough, but I don't know whether the balance is right.