Check the Sony website (in the licrary software, left column, click "bookstore") and Books on Board. Also Baen. They sell non-DRM books and/or LRF and Beb, which will read natively on your reader.
Also, anything that is PDF will work, but the ones that are "secure" Adobe Digital Edition seem to work best. Often this is available from Fictionwise.
And of course, ePub, which works great also. This is an up-and-comer that is showing up everywhere. There is some hope out there that it may win the day and become the standard ebook format.
Good Luck, Happy eBook Hunting, and Happy Reading!
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