Here’s some big news from today’s giant Chrome event: every Chrome OS netbook will ship with a cellular modem, and they will include some free data access from Verizon.

Users will get 100MB of free data access every month free for two years. And if you want to go beyond that you can without getting a contract — unlimited ‘day passes’ will be $9.99, and you can also buy data in chunks.

Of course, these netbooks will also ship with WiFi access. Most people will be able to conserve their limited free data for emergencies and lightweight data access like email.