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Never take GUI advice from a web site that hardcodes the width of its paragraphs to 600px.

Seriously, who does this in 2012?

People who understand, that there is such a thing as optimal line length, and that line running across 24" monitor does not have it?

While this is theoretically correct, it goes against the principle of the web.

Write the content, provide some structural guidance (paragraphs, item lists, etc...) and let readers decide how to render it.