Caecilia Font for ebook readers
Somewhere on the MobileRead forum (where I'm only lurking), I found a recommendation for the Caecilia font for use on ebook readers. The poster said that the font has thicker serifs, which would work better on e-ink displays. You can download the font on the FontYükle site. I got the "Roman" version, tried it out on my Bookeen Cybook Odyssey, and I think it's working fine - I still use it since I loaded it.
I don't think that it's a matter of "thicker serifs" though - I think the font just draws a bit "fatter" and wider, which works better on the display if there is lower ambient light. It's not as fat as the "Emboldened Text" setting of the reader, just slightly fatter. On the downside, the text looks less like in a book now to me. So from an aesthetic point of view, I don't like the font so much - while from an utilistic point of view it works well for reading.