At a slight tangent, but probably still applies, I have three ebook apps on my phone, and a fair few books split between them. As ^^, there are many free books out there, some quite recent; Cory Doctorow is a big exponent of the free ebook movement, his last two books have had a free ebook release at the same time as the physical hardback, but they're rare. A big problem is regional copyright. I have several books by various authors, but when I've tried to buy the next book in a series, I've been refused because my c/card is not a US one! Other well known authors in the UK have restrictions on their entire ebook output, like Kathy Reichs, who writes the Tempe Brennan (Bones) books. Some are just incomplete, like William Gibson, who has the second and third books of a trilogy available, but the first on a completely different source, (Stanza/Kindle), or else the first and second books available, but the third unavailable anywhere. Another issue is appalling transferrence; I have two books, one by Larry Niven, the Gil The Arm stories, and another by Neil Stevenson, Diamond Age, and the spelling errors are unbelievable, they've obviously been scanned from hardcopy, then run through OCR 'ware, with no proofing carried out. The Niven book is almost unreadable, and I actually paid for that! Trouble is I don't know what to do about it; if it was a dead tree book, I'd go back to the shop, but with an ebook bought via an app, I don't know where to go to, and I'm sure this affects the actual ebook readers themselves, as well as phone apps.