Easy to make bingo cards online... I use these for book report presentations to keep students in the audience focused on their classmates' presentations. I take words that will most likely come up in the presentations (as I have their book titles before-hand) and add them to the bingo card. I love the "shuffle" button which allows for a different card for each student! The kids can't wait to listen to the next report.
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).