Uh, pretty sure the kindle paperwhites can import epubs natively now.

The devices themselves can't read epubs (last time I checked anyway), but the "Send to Kindle" service will convert epubs to Kindle-formatted files.

And that means you give your epub to Amazon to convert, and whatever else they feel like doing with it.

He mentioned in the article that his Kindle is not connected to the internet (didn't explain why), so this is a no-go for him.