Hm. But if you get ePub as your intermediate format, and the Mobipocket (or whatever) desktop software takes in the ePub file and loads the Mobi formatted version onto your reader, does it matter that it just did a conversion for you? I think a lot of people have or expect some kind of main computer book management system. (I don't, but I'm a geek. I also drive a stick shift by preference.
)
If I had to have DRM, I suppose the eReader method of using a credit card number could be ok, but it still relies on some software being ported forward to any system I might want to use in the future. I'd rather not have to rely on that sort of goodwill (or longevity).