Yah, Seattle: I see what you are talking about: when you try to enable share, the message is "you haven't enabled a port to share", and the only offer is ethernet? I do share my wireless AT&T AirCard. Are you sharing with a PC, or more Macs, on Airport? It took me a while, when I first enabled the share on Airport. From System preferences > Internet and Network > Sharing, there is no joy. First go to Network Preferences: enable Airport; whatever it takes; Network name you self-assign. Now when you go to SysPref > Sharing > and check Internet Sharing, you get another scolding: "You cannot share 'cause no ports; or share from Airport to computes using ..." Go to Network Preferences > Airport > Network Name > Create Network, or if the other computer is up and around, > Join Network. Mine werke,s but it was ugly getting it up to a PC wireless ... I got it almost there and then had to go 128 bit encryption password etc to make the (corporate) PC happy. This is not plug and play ... Keep trying and take notes and post back.
