Night Spring. Thank you, great advice. This comes from the Configuration Utility's manual, exactly what I needed:
Quickly Activating Devices with iTunes
Before a new iPhone or iPod touch can be used, it must be activated by connecting it
to a computer that is running iTunes. Normally, after activating a device, iTunes offers
to sync the device with the computer. To avoid this when youre setting up a device for
someone else, turn on activation-only mode. This causes iTunes to automatically eject a
device after its activated. The device is then ready to configure, but doesnt have any
media or data.
To turn on activation-only mode on Mac OS X:
1 Make sure iTunes isnt running, and then open Terminal.
2 In Terminal, enter a command:
 To turn activation-only mode on:
defaults write com.apple.iTunes StoreActivationMode -integer 1
 To turn activation-only mode off:
defaults delete com.apple.iTunes StoreActivationMode
To activate a device, see Using Activation-only Mode, below.
To turn on activation-only mode on Windows:
1 Make sure iTunes isnt running, and then open a Command Prompt window.
2 Enter a command:
 To turn activation-only mode on:
"C:\Program Files\iTunes\iTunes.exe" /setPrefInt StoreActivationMode 1
 To turn activation-only mode off:
"C:\Program Files\iTunes\iTunes.exe" /setPrefInt StoreActivationMode 0
You can also create a shortcut, or edit the iTunes shortcut you already have, to include
these commands so you can quickly toggle activation-only mode.
To verify that iTunes is in activation-only mode, choose iTunes > About iTunes and look
for the text Activation-only mode under the iTunes version and build identifier.