Mobile Accessory retailer WirelessGround.com offers an USB Sync and Charge Cradle for the Apple iPhone. The cradle features a built-in Dock Connector, rear USB port for syncing, and an included AC adapter allowing the cradle to charge the iPhone without connecting to a PC. The iPhone USB Sync and Charge Cradle with AC Charger is priced at $23.
WirelessGround’s iPhone USB Sync And Charge Cradle says:
[...] Link via Upcoming Cell Phones [...]