I'm not sure if this is because your servers are overloaded to to a traffic spike from the just-launched Humble Bundle, but I am not able to download any of the PDFs from the My Downloads page. Clicking a link adds a "Personalizing - Click link again in 10 seconds to download" message, but waiting even a full minute before re-clicking the link has no effect.
Also, I don't suppose there's a "download everything I have not yet downloaded" option?
