Over the summer I've been unusually busy with the business and technical side of publishing. I've reformatted all my books behind the scenes and I've moved up a level from starter self-publishing and am just beginning to move beyond the basic retailers (Amazon, Barnes&Noble, Apple, Kobo) to a broader worldwide market. This has required my learning a great deal more about worldwide aggregators and distributors, as well as professionalizing (further) my use of metadata in the trade channels.
For those of you who aren't doing self-publishing, let me give you a quick overview. It's quite straightforward today to take your book, apply professional assistance in areas such as editing and cover design, and produce a product that is indistinguishable from the work of traditional publishing. Yes, the devil's in the details — you have to write reasonably well, too — but that's a given. There are no artificial barriers in the way of doing this.
The big difference is in the area of distribution. The US market is the furthest along, and ebooks are perhaps 20-30% of the US market. (Independent publishing is not well captured by book trade statistics, so there's a lot of speculation about the actual numbers). That number is still growing though the speed has slowed down and, of course, print isn't going away. Still, in fiction particularly, it's clear that ebooks will likely eventually approach 50%. The rest of the world is just getting started, but ebook adoption rates there might surprise you — remember, many third world countries went straight to cell phones without bothering with landlines much, so technology adoption rates do vary.