I recommend these typefaces, as they were designed for low resolution outputs (such as webfonts or laserjet),
These are free:
http://www.google.com/webfonts/specimen/Merriweather
http://scripts.sil.org/cms/scripts/p...=CharisSILfont
http://typophile.com/node/18207
...also good ol' Georgia does a surprisingly good job!
These are not:
http://new.myfonts.com/fonts/bitstream/oranda/