The main formats that the K3 use are DRM AZW and non DRM MOBI, so those would be the target formats to use.
I have a great deal of Mobipocket format books that I liberated from DRM once purchased, so if I had a K3, I would be able to read those.
What concerns me though is that as MOBI slowly becomes extinct, just as LIT for instance, is that Calibre will drop the features to make the conversion (LRF support as an example). I doubt that will happen soon, but it will happen.
Of course if you still use Mobipocket Creator and Mobipocket Desktop, you can still create MOBI ebooks from other formats such as HTML, RTF and PDF.
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