bryan_d_robinson on July 18, 2011
I think I found a solution that will work. You have to have iOS 4.0+ and make sure to install the free iBooks application from Apple from the iTunes app store.

To install the PDFs, drag the PDFs from your PopupCantonese iTunes feed to your desktop or another folder. Then, in iTunes, select iBooks from your "Library", and then copy the PDFs from your desktop or the other folder to the iBooks library by dragging them. When you sync your iPhone again, the PDFs will be copied to the phone and you can view them in the iBooks app.
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