Offer PDFs, for your own sake... since your books seem rather of the sort that many people even without an eBook reading device would buy and read on their computer or print out for personal use.
If you offer PDFs sized for eBook reading devices too, all the better. Certainly nobody in their right mind should purchase letter size PDFs for reading on a 6" screen.
But, as already eloquently stated, well more than 90% of people on this board will not bother with you unless you offer ePub.
Probably would be best if you permitted, after purchase, your customers to download the book in all the formats you offer.
- Ahi
Ps.: With the name/domain you have... one wonders why you don't go general, instead of focusing on what are admittedly fairly niche markets. Best of luck to you either way though!
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