I'm hoping amazon will get round to supporting library epub just to have feature parity with other ereaders, as they did with lending. Then we will get epub capability in the back door sort of way. If that happens, amazon will pretty much own my butt, which I will happily sell to them
Edit:
Oops ever say something that came out dirtier than you intended? I just realized I used back door and butt in the same paragraph.