Comment Thinkpad (Score 1) 201
Wasn't IBM there first?
This:
http://upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Thinkpad-x61-tablet.jpg/548px-Thinkpad-x61-tablet.jpg
Transformed into this:
http://upload.wikimedia.org/wikipedia/commons/thumb/4/42/Lenovo-X61-Tablet-Mode.jpg/800px-Lenovo-X61-Tablet-Mode.jpg
Im not sure if all models required the stylus. A friend of mine used his finger to use the touchscreen.