This article came out a couple of days ago about infield top aligned labels.
I like the infield top aligned label part, I can see how that might be helpful as opposed to the traditional labels and their placements. But I'm wondering about making the form a grid where some inputs line up horizontally rather than vertically. Traditionally, clear scan lines "allows people to respond quickly to questions and complete their task with a minimum number of diversions" and "increase completion rates by keeping people on track and ensuring that they see and respond to all questions a form asks them" (Luke Wroblewski - Web Form Design). But is this only with the traditional labels? This type of labelling is more compact without the white space so perhaps that helps? I think probably not. But that leads to my question:
Currently, Google is just pointing me to this article, so I suspect this is a new design but has anyone already done this and tested it against the traditional left aligned input forms? Is it faster? How are the conversion rates?