Well, I can only speak about the conversion stuff, even though I have K3 Wifi, as I have not had documents emailed directly to the device yet.
@OP: The FREE Amazon doc conversion feature via email is great. Send an email to <insert your account name here>@free.kindle.com, be sure to write "CONVERT" in the subject line and then attach stuff like PDF files, .docs, whatever. Few seconds later, Amazon will send you back a AZW version of the file suitable for your Kindle.
I do not choose to receive the docs via Wifi directly on my K3 because I like to edit the book metatags first. So, I have been transferring books to my K3 exclusively via USB.
not much, but hth all the same,
-les
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