Soli looks very interesting. There is Smarter Objects from MIT Fluid Interfaces that is similar in nature, but has a more dynamic approach. It's certainly not as simple as Soli seems because of the augmented-reality component it uses. But if Google brings back Glass and ships Soli in IoT/smart household objects, then you'd have the same result.
--EDIT-- Link to MIT Fluid Interfaces Smart Objects: http://fluid.media.mit.edu/projects/smarter-objects
I have been using Windows Tablet PC since 2003 (HP, Toshiba , and now Fujitsu).
The (typically) Wacom stylus works very well and with OneNote, allowed me to take extensive class notes across two masters programs.
OneNote also interprets the handwriting so it was quite the pleasant surprise to find that my scribblings were somewhat searchable.
How about some form of chorded keyboard or glove? A chorded keyboard was demonstrated in 1968 by Engelbart:
http://web.stanford.edu/dept/SUL/library/extra4/sloan/mouses...
Google's Soli project might lead to better input:
http://youtu.be/0QNiZfSsPc0