To disable iTunes launching from app store links
Download RCDefaultApp from http://www.rubicode.com/Downloads/RCDefaultApp-2.1.X.dmg
Open the DMG file and copy RCDefaultApp.prefPane to ~/Library/PreferencePanes
Go to System Preferences —> Default Apps —> URLs tab —> itms
Set Default Application: to disable
Done.
App store links will no longer launch iTunes. Pass the word.
