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Welcome.
When you say 'finished in PDF format' I assume you mean your prepress files. What are those prepress files done in? InDesign, Quark???
Basically to cover the devices you mention above you're looking at two formats, ePub (iPad, Nook, Kobo, Sony, etc.) and Mobipocket (Kindle). PDF is generally not a format most ebook users prefer, although there are circumstances when it might be desirable.
Are your books mainly text or do they have lots of diagrams, tables, images, etc?
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