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To add to what Hidari said: it's not the PDF isn't a useful format - it is, of course, extremely useful for the purpose for which it was designed, which was to provide a precise digital representation of a specific printed page. As such, it's perfect for reproducing pages from journals which have complex layouts with equations, graphs, or tables, for example.
The problem with PDF is that it's a page-based format, and there's just no satisfactory way of handling it on devices whose page is the "wrong" size, other than by allowing the user to "pan" around the page. That works fine on LCD or CRT displays, with their virtually instantaneous response times, but isn't at all satisfactory on slow eInk screens.
So, unless you've got a PDF that's been specifically formatted for the display size of your device (as, for example, Hadrien's excellent "Feedbooks" site will do) it's best to avoid PDFs for eBooks. There are numerous other formats available, and really no good reason to want to use PDF - for fiction, anyway. I'm aware that a lot of technical books are, unfortunately, only available in PDF format.
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