I don't understand why Apple doesn't just give the iPad a USB port. I have an Android tablet that has one and to get multiple PDFs transfer is as simple as plug in the USB key, and copy and paste.
I've often thought about moving to Apple because of the high quality of the products, but I don't think I should have to install iTunes, email myself or first upload to a cloud server, just to read a PDF on my device. Until that changes I will have to stay with Android. PDFs are the most frequently used file format for me, so moving from a simple transfer system to a more complicated one is still a deal breaker.
Does anyone think that Apple, with increasing tablet competition will ever change their minds and add a USB port to the iPad?