Detachable displays make for big tablets
Sony's ( VAIO has a 20-inch touchscreen with a retractable kickstand so that it can lie flat on a tabletop. It can be toted around untethered for up to three hours. )
The ASUS Transformer is a Windows 8 PC with a detachable 18-inch screen that doubles as an Android tablet.
The maker of the iPhone and iPad doesn't play favorites - exactly. But these apps have gotten extra attention from Cupertino.