Originally Posted by JSWolf
There is one reason. So Kindle owners can borrow eBooks from the library. Lack of library access is eventually going to be a downfall of the Kindle (IMHO).
I agree they need to support epub, but my library has both epub and mobi (not generally for the same book though).
It's the access to both libraries and industry standard (i.e. epub) that will either force Amazon to support epub or it will fail in the same manner as betamax and mini-disc...