In this case you should use manybooks.net.
We provide e-books with TOC and that are formatted a lot better than those at feedbooks.com too, but we don't have as many books yet (we're not dumping a single text file like PG or manybooks, but adding a book to a DB and dividing the book in chapter/parts/etc...). But you can pretty much get what you want from feedbooks too since it's possible to upload a book on the website (it'll take a little longer than just downloading one, but once someone made it for a book, it's available for everyone both for the Sony Reader and iLiad).
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