iOS 5 may bring OTA updates to iPhone.

"9to5 Mac claims to have confirmed with multiple anonymous sources that updates delivered following Apple’s iOS 5 release could take advantage of a new OTA update mechanism that will deliver incremental updates directly to devices rather than to iTunes. The report specifically notes that Apple has been in talks with Verizon Wireless regarding OTA updates, though the feature would obviously be available to any carriers that agree to deliver the updates over their networks. OTA updates would certainly be a welcome addition to iOS."