Have you ever found a really great PDF – perhaps a book a paper – that you found extremely useful but couldn’t find an audio book for? This is likely the case with many PDFs, since few will make it into audio books, and they are bound to cost you. PDF2Tape is a Mac app worth $0.99 in the Mac App Store, and a stroke of pure genius. The concept is simple; take a PDF and convert it to an audio file in either ACC or AIFF format. The app uses the default Mac voice and narrates the entire content of the file for you to play back. It is ideal for PDFs that you don’t have the time to read, or would prefer to listen to but can’t find in audio format.