I don't know of any recent studies, haven't really looked, but I've been typing in Dvorak for about two years and this is my take on it.<p>1. I don't think the superiority of one or the other is really the issue here. The issue is making the switch. Those studies are addressing whether it's worth it to switch.<p>The bottom line is that Dvorak is more efficient in terms of movement. It's optimized for typing in English (other romance languages are quite similar) and QWERTY just isn't.<p>2. From personal experience, I think that the mappings of punctuation are superior in Dvorak. I especially like having the dash and underscore easily accessible (next to Return) for programming. I also find punctuation more natural overall in Dvorak.