for those of you who thought that sans-serif faces [or 'fonts' as they are now called in the computer world] were MORE readable than serif faces, have a look at this post.
or not. let's say some more. does this mean that you should never use sans-serif faces? of course not. but FONT NERDS recommends that you reserve them for display faces, for running headers on a book page, or for small, self-contained portions of text [such as a blurb on a dust-jacket]. that is the place for such faces. but for long passages of continuous text, go with a classic serif face. your readers' eyes will thank you for it.