Sergey has one of these devices so let me take a few pics of the type using my wife’s EOS 20D (which I have no idea how to use) but here goes...

Bitstream Swiss and Dutch and Freetype too. I wonder if hints are used? Probably not.

Here’s the Swiss, used in the UI - looks a bit blotchy up close...



These are not quite in focus, but it looks like the bold might be fake?

More UI

And Dutch used for the eBook content. Stem ’color’ seems uneven.

Would you like fake small caps with your fake italics? ;-)

More Dutch text up close.

More like it, Calibri embedded in a PDF - stems still inconsistent, spacing is whack (compared to Office 2007 and Adobe Reader 7). I had to generate the PDF at a small paper size (here 4 x 6) because the 11pt type was too small at A4. Device does not appear to have good zoomability. :-(
Word 2007 and Adobe Reader 7 rendering as a comparison.

Close up

And Cambria.
The original in Word.
One other quirk, spotted by Sergey, (maybe specific to Word generated PDFs?) is that PDF pages that use fake bolds take a long time to render on the device. That will teach people for using fake bold! An electric shock would be good too.