Same here. It's defiantly down.
I had to plug my Kindle it and sideload my books. I have the most flaky browser on my K3. I have to reboot the Kindle to get it to download from Dropbox every couple of days.

I tried emailing the book to gmail but the Kindle browser doesn't support separate windows so I can't download it. Is there a web email where I can send myself an attachment?
I need a backup.