My dislike of Kindle (A.K.A. Mobipocket) is only about its presentation limitations. I guess that comes from being a high volume producer and having to deliver the bad news about the Mobi limitations to publishers every day. And now apparently Amazon announce that their non-forward compatible format will be available on the non-backwardly compatible Windows 7.0. That all seems such a move in the right direction! Especially if we really want to make compelling e-books that are not poor cousins of print but rather a new publishing genre. So many exciting publishing opportunities crushed by Mobi-mediocrity and Win-unwind.
When Amazon announces support for e-pub, that will be something to announce (of course if they ever do they wont include SVG support and will use some quirky rendering engine). E-pub may not be perfect, but it is about a zillion light years ahead of the '90s crap being shoved into our lives as innovation.