Here's a nice little nifty tip to read PDF files on your iPhone or iPad using Apple's new iBooks app using Dropbox. Dropbox is an amazing cloud storage app that works on several platforms, and one of them happens to be iOS, making it possible to transfer PDF files to your mobile device.
Once you've got the files uploaded to Dropbox, though, how do you get them into iBooks? Just find the PDF in Dropbox on your phone, hit "Open With" and choose iBooks. It's easy as pie, and your PDF files will automatically sync through Dropbox, too. You don't even have to bother plugging in your device or using iTunes. Brilliant!