I am not able to read pdfs on the iPhone but I have been using the books.app program and it works nicely. I am always surprised to find people complaining about the size of the memory. When I had my Pocket PC, the most memory that it came with was 64 MB. I used CF and SD cards but those were only 1 or 2 GBs. The larger capacity ones were way more expensive. At 8GB or 16 GB, I would think that there would be plenty of space for your books.
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