I'm not so glad to see Amazon's Kindle overtake in terms of market share just about every other ereader out there. I have a suspicion of monopolies and vendor lock-ins. I chose my Sony Reader because it supported a more universal format with no vendor lock-in (we don't get a Sony Reader Store here), but I would rather go Pocketbook or Kobo than buy a Kindle. I'm happy to recommend the Kindles to others if I think it's suitable (and it often is the case), but I have my own hang-ups I like to humour. Of course, if someday it comes clear that Amazon has locked down the ebook market as tightly as Microsoft used to for PC software, well, resistance is futile.
(Before somebody jumps in to say that they can also sideload books from other vendors and can load their own MOBIs on the Kindle, etc., Amazon would still rather have people buying from their store. Not even the fact that it doesn't support EPUB, but rather that the Kindles don't support reading DRM-protected MOBIs also suggests to me this.)