Ever write up a huge long post about something relevant and hit the backspace key when you think you're in the edit box only to have the browser window interpret it as "Back" losing all your writings that just took you an hour to put up?
RAWR!!
/sniffle
Grimnir's Grudge 
I always write whatever is longer than a paragraph in Word or something to that extent just for that reason.
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I use the preview button a lot, which means if I do something really dense, I can grab the text back from the preview browser.
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