Four short links: 5 July 2012

Neocover — very clever idea: magnetic light-switch frames, from which you can suspend keys and other very-losable pocket-fillers.
Design of Checkout Forms (Luke Wroblewski) — extremely detailed, data-filled, useful guide to state of the art (and effect of) e-commerce checkout forms. In tests comparing forms with real-time feedback to those without, usability testing firm, Etre and I measured a: 22% increase in success rates; 22% decrease in errors made; 31% increase in satisfaction rating; 42% decrease in completion times.
Less is Exponentially More (Rob Pike) — wonderfully readable introduction to the philosophy of the Go programming language. What matters isn’t the ancestor relations between things but what they can do for you. That, of course, is where interfaces come into Go. But they’re part of a bigger picture, the true Go philosophy. If C++ and Java are about type hierarchies and the taxonomy of types, Go is about composition.
3D Manufacturing Business Plan — numbers for an existing business built around 3D printing. Fascinating to see the economics. The author makes the point: Based on these volumes, this product would be impossible to produce profitably by any other means.

Magnetic Frames, Checkout Design, Programming Go, and New Manufacturing