Don't know if this has been posted or not but here it is.
What you need is the 4.2 update and the app called cloudreaders now all you need to do is go to where the PDF is clickon it so it will download can take a while just did a 23 Meg file took a little while.
As long as the progress bar moves let it go when it is finished the PDF opens and you can read it in Safari like normal now just hold your finger down on the screen and up top a option will come up that says open in cloudreader just hit that and safari will close and cloudreader opens and the PDF file will open in cloudreader and will be saved automatically.
So now you can read it whenever you want now cloudreader is free too it also can read just about any format I have a lot of cbr and txt files.
I hope that's not to confusing and helps someone.