Kinda funny how Scribd is using one Adobe platform -- Flash (esp. FlashPlayer) -- to chip away at another Adobe Platform -- PDF (Adobe Reader and Acrobat).
I used to dislike both Flash plug-in launches and PDF Reader launches equally. Now, the combination of Adobe's work on making the Flash Player launch faster (helped along by the format's ubiquity -- it's probably already running in another tab), plus FlashBlock, means Flash is much less annoying than PDF.
So: bravo, Scribd, for marginalizing PDF even further.