It is "more bad" or "less good" when the __line length__ is long than when the __line length__ is short. No matter whether on paper or on-screen, fully justified text becomes harder for humans to read as the line length gets longer. This is, mostly, to do with the between-word spacing, because human beings do not read letters and words individually, they read them in varying sized chunks [much research on this topic is available].
I concur with everything inkfree said regarding justification and line length. To wit you may say "but, morbus, why would you want a fluid design by default if you agree that long lines are wrong?" For the exact definition of "fluid" - it is more malleable. I can resize it to how /I/ feel is the best reading ability for me, my screen, my font size, my current workspace settings, and resolution. Also, some pages of Drupal simply look like ass when wrapped - consider the watchdog log: it was never meant to word-wrap (if it did, we'd never have limited the initial message display to a certain letter limit). -- Morbus Iff ( they should rename controlled chaos to morbus droppings ) Technical: http://www.oreillynet.com/pub/au/779 Culture: http://www.disobey.com/ and http://www.gamegrene.com/ icq: 2927491 / aim: akaMorbus / yahoo: morbus_iff / jabber.org: morbus