We've been using YouTube to watch great videos, like clips from Mary Poppins, and videos of babies laughing and dogs skateboarding.
The baby just loves these things. They are short - just a few minutes long, each of them - so they don't get boring to him. We can just watch one, and then move on. He sits on Mommy's lap and copies the sounds of the animals or helicopters or whatever it is that he sees.
It's a great resource - much better than tv for kids!