Sony UX Micro PC
Not an origami UMPC, but interesting nevertheless. The integrated biometric fingerprint sensor is a nice touch.
Sony UX Series at the sony site. Review at Digital World Tokyo.
It's not much larger than my i-Mate JASJAR. However, like most systems going the UMPC or tiny laptop route, battery life looks to be terrible.
I won't add this to my "must have" list, but the concept is interesting.