Bingo Baker makes it easy to create bingo cards. You can generate hundreds of random cards and print them using the printer-friendly PDF (with no ads or watermarks). You can also save paper (and waste electricity instead) by playing your bingo game online (it works on the iPad).
Instructions: Just type your words into the grid on the left. You can give your game a title and can change the BINGO column headings too.
Then click the Generate button.
If you want to save your cards for later use, or print more than 8 cards, you need to create an account.
Don't panic about the text in the boxes on the left not being vertically centered. That's just the way textboxes look. Your generated cards will look a lot better!