[windsurfer]

But this is pure client-side. Scribd does server-side generation of the HTML5 page.

[skimbrel]

Yeah. If this gets more robust and productized, it just might eat Scribd's lunch.

[webXL]

And Adobe's

[dualogy]

...not sure. They're not exactly charging for Adobe Reader. If end users or site owners switch to a less bloated viewer, they still keep using Adobe's PDF format.