KARTU: you might want to take a look at this font:
http://scripts.sil.org/cms/scripts/p...=CharisSILfont
This is the font that is used in many Overdrive books. It's free and although I haven't looked closely at the license, I imagine it's very liberal and that's why the library books are using it. It's very good and it also has all the extended characters, as far as I know.
BOOKTODE: there are two different ways to change the font on the Reader (but both ways are for epub, I think?). The first is to copy a font onto the reader, and then change the CSS for each epub file to refer to that font. The second is to install new firmware so that the default font on the reader actually changes. Personally, I have been too chicken to try the second method, but you can find it if you look at the link at the top of the Sony board that says "Dev Corner." I don't read PDFs on my Reader, so I'm not sure how they are affected. Mostly they have their own fonts embedded, don't they? If they don't have a font embedded, then I guess they would use the default font on the reader.
SHANE: I think the only way to make an epub with embedded fonts use the default font, is to explode the epub and strip all references to the embedded font.
eP