brundlefly
I could be very wrong, but thought I remembered that being one of the big complaints about iPads - that they can't open PDFs...
I have about 50 .pdf files on my iPad. I first copy the .pdf file to my Dropbox. Then in Dropbox, I select the file and clicking on the file transfer icon (a square with an up arrow), I select "Open in..." and choose "Good Reader".
Once the .pdf file is in Good Reader, I make a "New Folder", rename to the software/hardware product (i.e. Sonar Ozone 5, Jupitor 80, etc.) and move my file to that folder. I then delete the file in Dropbox to save space.
I could also transfer using iTunes, but I find this easier for me.
Walt