This tip goes hand in hand with Tip 13: Email as attachment".
If you ever need to export a Document, Spreadsheet, or Presentation from Google Drive, there is a built-in feature that allows you to download any Document. Even better, the "Download as" function provides a number of different choices of file formats, including PDF. Essentially, Google Drive can act as a very versatile (and free) file exporter!
Here's how: