To enable IPCC (carrier profile) installation on iTunes 8.2 on a Mac, open Terminal and type (better yet, paste):

defaults write com.apple.iTunes carrier-testing -bool TRUE

If iTunes 8.2 is already running, quit it and relaunch it to have this take effect.

Octothorpe (irc.osx86.hu #iphone) made this discovery at Jun 10 11:05 AM GMT.