Originally Posted by Alyssa Miranda
It may be out there, but to date I haven't found anything better than the hoops the customer must endure (i.e., those noted above for Smashwords) to obtain content non-wirelessly. If there were such a service, ideally it would:
With the exception of Kindle (via the personal documents email service), the devices themselves (and their related ecosystems) aren't really set up to do what you want. I believe Baen offers the Kindle email delivery option, where the customer can enter their device email and have the book delivered to the Kindle. However, even this option requires that the customer manually go to their Amazon account page and add the Baen email address as a trusted sender.
Devices that have a browser, as well as tablets, can be used to access the site directly, and download the file right onto it. How this works can vary by device, and may require MIME type configuration on the server side.
Take a look at Baen's ereader instruction page
. While it's a bit long due to the different device types, I think their instructions are pretty clear, and cover multiple ways of getting the ebooks onto the devices.
It's worth noting that anyone who has ever bought ebooks from somewhere other than the store "attached" to their device has likely already had some sideloading experience. I'd also wager that a good portion of those who haven't bought from outside their ecosystem probably aren't going to buy your book unless they can get it in their preferred store.