It's not built into the product, but Napkee (http://www.napkee.com/) can make both HTML/CSS/JS and Adobe Flex 3 versions of Balsamiq Mockups BMML files.
OmniGraffle, Balsamiq, AxureRP and Visio are pretty much the industry standards. Mostly OmniGraffle and Visio. The fact he doesn't even mention Visio just goes to show.
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[ 3.7 ms ] story [ 25.2 ms ] threadPidoco has this functionality. Wondering if any of the other tools do as well.