1. No. Amazon made some changes starting with the 2.5 firmware and no one has yet figured out how to liberate files sent to a Kindle that's 2.5+.
2. Yes. That's the only way it'll work, unless you have an iPhone/iPad app. You can now also do Mobipocket (but not Topaz) books via Kindle for Mac, thanks to some nice people who managed to figure things out in the past month or so.
3. Yes. Both Mobipocket and Topaz, though if you want to convert Topaz to another format, there are some extra hassles involved.
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