In XCode 3.x, we have to set the following company marco so that new source code won't show __MyCompanyName__ in new source code:

defaults write com.apple.Xcode PBXCustomTemplateMacroDefinitions '{ "ORGANIZATIONNAME" = "First Water Tech Ltd"; }'

However, it won't work in XCode 4. According to XCode 4 release note:

The ORGANIZATIONNAME substitution value in templates is now replaced with the Company Name from the current user’s Address Book card if present, rather than _MyCompanyName_. If the PBXCustomTemplateMacroDefinitions user default has already been set, it will be honored.

That we have to set the company name of my name card in address book of the MacOSX.