This is what GearDiary think about the U1010 from Fujitsu: 

What I Like: Ultra-portable form factor, good video performance, reasonable price.
What Needs Improvement: 800 x 480 pixels should be a screen resolution option, a Pentium M would've been a better choice of processors, the keyboard is too small for touch typing.

I always recommend anybody thinking about to buy a 5 inches UMPC to check one personally because if you have poor eyes you won't be able to use them at all. Seriously. But in another hand they are super portable.

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