How much TV should kids watch?

One thing I've learned as a father of two toddlers is that the TV can be a great babysitter!  I'm assuming video games will follow in a few years but for now I'm concerned about how much TV is "appropriate" for a toddler.

According to the internet, which never lies, two thirds of infants and toddlers watch TV for an average of 2 hours per day.  The number of hours rises to 4 per day for kids aged 8-18.

Between movies and TV, my kids, both under 3, watch at least 4-5 hours.  What's your opinion?

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