Setting copyright statement on a per-project basis?
You can change the organization Xcode currently uses by issuing the following command in Terminal:
defaults write com.apple.Xcode PBXCustomTemplateMacroDefinitions '{ORGANIZATIONNAME = "Some Company Name"; }'
You can then create scripts that switch the current company for Xcode.
Upgrade to Xcode 3.2, which now has a project setting for organization name.