Best way to buy and read go books – Go Books Review
If you want to study go, this app should be a no-brainer. You can play through the diagrams right in the books, which is really handy. The books cost money but you can read sizeable samples before buying any of them. It's really amazing and I hope it gets even more books over time (and it has been doing that regularly).
Review by Brentus on
Go Books.