Artefact created a radically simple printer concept called SWYP (See What You Print). Basically, it incorporates a large touchscreen that displays the print 1:1 so you can see exactly what will get printed. You can edit the image before printing it.
Seriously, though, isn’t this the same as seeing and editing the photo on your computer screen or on the iPad before printing it? Is the 1:1 format the only saving grace?