Big benefits in Scribd’s switch from using Flash to create and display their content to using plain ‘ol HTML5, CSS, and Javascript:

Over the last few months, user engagement on Scribd has surged, according to CEO Trip Adler, thanks to its transition to HTML5, the introduction of the iPad, and Scribd’s Facebook integration. Of these three factors, Adler says the conversion from Flash to HTML5 was by far the greatest driver for his document sharing company. According to Scribd’s numbers, time on the site has tripled in the last three months.

Anyone surprised? Make your content easier to read and interact with and more people will do so.