Let me second =X=:
PDFs made specially for 6" screens work faster and (can) look better than files in any other format. However, in comparison to PDFs that are not intended for 6" screen viewing, all other formats work better.
Take the above with the caveat that PDFs do not offer very good quality resizing (if at all) or dictionary support. But, on the other hand, all the other formats despite their additional perks fail to get typographic fundamentals right (which everyone professes not to care about, but I am fairly sure most people would be hesitant to buy a paper book that looked the way too many present-day eBooks do).
Having said that, for the Sony Reader, LRF can get you the most decent looking eBooks (even if they will be somewhat plain), because at this time proper justification is not supported by the reader for ePubs. RTFs and plain text files I have not played much with... but they sure seemed slow. Not much slower than ePubs and LRFs though--at least in comparison to my 6" customized PDFs.
The question is, I suppose, how capable are you of generating your own custom PDFs? If the answer is anything short of "supremely", you are better off sticking with LRF and ePub files, or, I suppose, with RTFs and plaintext documents.
- Ahi
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