A member of the forum OQO Talk named TRF has managed to successfully hack the OQO to run OS X Leopard. The OQO is setup in a dual-boot of Vista and OS X Leopard.
Wifi, sound, power management, and Bluetooth all work, the only thing missing is WWAN access and TRF is already working on getting that running.
While it isn’t exactly an easy hack TRF says that it is “definitely doable.” This makes the OQO now the smallest computer to run OS X (that I know of at least).
This is absolutely amazing to me, I don’t think that I would ever use this, mostly because I would rather just buy a MacBook and an iPhone and save myself a lot of trouble messing with stuff, BUT, I can appreciate the novelty of it.