Lenovo has created a yoga inspired Tablet PC style device, complete with wireless mouse and keyboard. It won't make it into production, but this design concept picked up the Red Dot Luminary award for 2005.
From the Red Dot award site:
The concept for the Yoga laptop is hinged on the bending of the mind. The design harmonises the personality of the user with the object of use. This multi-functional laptop is realised through the inclusion of an innovative soft hinge technology support that allows for three modes of self locking position: as a general laptop, tilted at 300 degree angle as a table display screen and bent over at 360 degree angle as a drawing pad. In keeping with the flexibility of use and transport, the Yoga laptop is designed with a detachable keyboard and wireless mouse. Yoga laptop, finished in tactile leather material has an inherent built-in visual identity technology programmed to automatically identify its owner. This makes it an object that is personal and secure.
Lenovo Yoga Tablet PC Design 
