lunapark6 has published a detailed and nice review of Sony VAIO Premium Series VGN-UX390N Micro PC.
From the article:
This little beast packs the power of a full blown Microsoft Windows Vista computer into a form factor of only 5.91”(W) x 3.74”(H) x 1.27-1.50”(D). When you first look at the palm sized portable device you may guess it to be a souped up version of the Sony PSP, but if you take a closer look at the $ 2,449.99 sticker price, you will probably guess it does a whole lot more. And that it does.
The amount of features packed into the UX390N is impressive in its own right.
I want one :D