Never done this before, but I just backed up a new Kickstarter game by Monte Cook: Numenera.  I am quite excited about the game.

ULTIMATE EBOOK FAN: You get the PDF of the Numenera corebook, the PDF of the Player’s Guide, and the character creator app. You also get a PDF of an exclusive Numenera adventure available only to Kickstarter supporters. Lastly, you get a PDF version of every single product released as a part of the stretch goals.