It's a shame it's so chatty. Unless you're using it as a simple IFrame embed, it will fall over on xss errors.<p>In Twiddla, for example, we'd like to include a bit of custom script to detect when you click the "next page" button so that we can keep everybody synced up. That means we have to proxy it through our server and mess with the markup a bit. That's easy to do in Scribd's viewer, and it actually worked fine in Gdocs' view before October last year.<p>Then they changed things & got all fancy. Shame.