How do I copy PDFs onto my iPad and read them there? I've amassed a collection of books in PDF format (through occasionally buying the O'Reilly Media Deal of the Day), on my MacBook Pro.  I'd like to get them on my iPad, where they'll be more convenient to read.  How do I do that?  Should I look at Dropbox, and download a PDF reader app?  (Do you have one to recommend?)  Or is there a better way?
iBooks has built-in PDF reader support. Just download it for free from the App Store, then drag the PDFs that you want to copy to your iPad into iTunes. The PDFs will be listed under the "Books" section. Sync your iPad, then when you open iBooks, tap the "PDFs" tab and your PDFs will be listed.