The very expensive Asus Taichi is still my favourite Windows 8 convertible, and in the above video by Asus we see the device put through its paces.
The dual-screened TAICHI21 is available in a 1.7 Ghz Core i5 and 1.9 Ghz Core i7 processor versions.
The 1.7 Ghz device has two 11.6 inch IPS Full HD screens with 10 finger multi-touch, 4 GB RAM, 128 GB SSD and costs $1,300 and comes with a pressure-sensitive pen.
The 1.9 Ghz Core i7 version has a 256 GB SSD and costs $1,600.
The device is available to pre-order from Asus here.