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Re:Aaron Swartz's Jottit has been officially released by axod on Sunday September 16, 2007 @03:11AM (#55190)
If all you want is a preview functionality, how about

<textarea name=foo onkeyup="document.getElementById('preview').innerHTML=this.value;"></textarea> <div id=preview></div>

Hardly rocketscience is it...

Re:Aaron Swartz's Jottit has been officially released by breck on Sunday September 16, 2007 @07:58AM (#55242)
Or try the Web Developer Extension for Firefox:

https://addons.mozilla.org/en-US/firefox/addon/60