I'll probably continue to purchase 95%+ of my books via the PC too. It is much quicker and easier to browse the bookstore with the PC. I also habitually deDRM all my purchased books and squirrel them away for a backup. But unless I need to modify them, I typically just have Amazon send them to my Kindles. However, I have purchased quite a few books (hundreds) over the years from bookstores other than Amazon. This new PD cloud feature is a godsend to me in that those modified books and those purchased elsewhere can now be emailed to my Kindles and are now fully syncable between devices.