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Mac's PRINT command has PDF option. If you look closely at that option there is an EDIT MENU option. Select that and use the plus sign to add your DROPBOX or a sub directory in your DROPBOX to add SEND TO DROPBOX as an option when creating a new PDF with the PRINT command.
While studying or browsing the web a quick PRINT creates a PDF that is easily shared with the iPad. On the iPad simple app like DROPBOX, or GoodReader quickly move a file from the drop box to the iPad and then allow you to OPEN WITH a variety of iPad apps.
Slick and Fast!