I want to correct a previous post I made about using GoodReader to read pdf's you store on iCloud. Yes you can do this but it takes some monkeying around. Note - you do not use Preview to store the pdf's on iCloud. Here is how you do it -
1) Install GoodReader on your iPad or iPhone. Next, in GoodReader go into the General Settings section and enable the use of iCloud.
2) Then go to your Mac. In Finder, go to the ~/Library folder (it is a hidden folder - click on Go in Finder while holding down the Option key, then click on Library). Then go to the Mobile Documents folder. You should see a folder that has GoodReader in the folder name. Go to that folder and make a alias of the Documents folder in GoodReader. You can then drag that alias to your sidebar in Finder, your Desktop or the Dock.
3) Then simply copy any pdf's you want to store on iCloud to that folder. Start up GoodReader on your IOS device and files are there. Once you got the initial setup done, it works great.
Enjoy.