Spoof your MAC address with Services
*Edit 1/25* Check out my updated post with a link to a better spoofer.
I was playing around with Automator the other day and wanted to be able to spoof my Airport’s MAC address on the fly. It took me a little bit to figure out some variable trouble but I finally got it where I wanted. You can download the service and watch the video after the read more link.
You can download the service here. Simply place the file in ~/Library/Services and assign it a shortcut in the Keyboard Services Preference Pane.