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Justified text is hard to get right as it needs typographic attention to prevent rivers or loose lines appearing - something that's not going to be realistic in the flexible layouts of the web.

Also, apparently dyslexic people have a particularly hard time reading justified text, but I don't have any good sources for that.

I personally despise justified text. Losing the ragged edge means it's easier to lose your place, and varying spaces between words just means more brain-load if you're reading quickly.

It's odd. I find justified text difficult to read on a screen, but when it's printed I read it easily, without even noticing it's justified.

If the reason for this is that screens are lower resolution than print, I would expect reading justified text on screens to become easier over the next few years, as 300dpi screens first become available and then common.

While although there a few not-so-simple ways to do it, hyphenation is a problem (among others) and leads to rivers:

http://en.wikipedia.org/wiki/File:The_river_effect_in_justif...