I have to disagree. Yes, Kindle reader came out using Web SQL DB, but that spec is dead and for good reasons. I don't know how far along IE is at supporting IndexedDB, but it won't be long before Firefox, Chrome and IE all support IndexedDB and then it will make plenty of sense for Amazon to build Kindle Reader on top of that. From what I read, iOS 5 doesn't support IndexedDB, sadly. But it will in time.
I'm still surprised that no one has written an IndexedDB shim on top of Web SQL DB.
But with what do you disagree? That WebSQL and IndexedDB are competing standards? From the point of view of a web developer, they must be, or we wouldn't have gotten into this situation in the first place.
I'm still surprised that no one has written an IndexedDB shim on top of Web SQL DB.