For awhile I was buying ebooks straight from the Kindle store on the device itself but something about paying the same price for a file as a hardcopy left a bad taste in my mouth. I'd rather have something to put on my shelf and I can loan to friends. Plus paying for the book up front is a bit of a risk if it sucks, because I can't return it or resell it or even give it away to someone else.
The past few months I've just been loading the books straight to my phone and I've read more new books in the last 3 months than I have in the last 3 years. Definitely a game changer.