Art does have 1 year contracts on most of their phones for new activations only. All upgrades are 2 year contracts. The iPhone and data products such as air cards are only available on 2 year contracts or no commitment agreements.
You do not get the full discount on the equipment on a 1 year contract like you do on a 2 year one. The phone will usually run you about $150 more than on a 2 year one.