The Apple iPad will come with two 3G data plans through AT&T, one of which is just $30 per month with no contract. You can cancel at any time with no penalty, and use AT&T Wi-Fi hotspots for free.
The other plan offered is $15 for 250MB of data, also through AT&T. You can activate directly from your iPad, which is objectively a pretty great deal given that you generally pay $60 for unlimited data on your laptop. The ability to cancel whenever you want to is also a boon, given how out of hand ETFs have gotten lately.

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