Existing users, 
Can someone please explain why this is needed? Is it supposed spoof your IP address on the Internet?
When I run it all it does is disconnect me from the Internet and I have to restart to get it back.
If it spoofs the IP address on the internet, I think that is great, if it works. If that what it is supposed to do?
ChangeMAC
Spoof your Ethernet or AirPort MAC address.
Version: 1.6
Why?
Feedback Type: Commentary
Contributed by: Brass Hammer Thursday, September 20 2007 @ 08:21 AM PDT
Product Platform: MacOSX
Used Product For: Less than a month
Recommend Product: YES
Comments
Why? - matthk
It spoofs your MAC address, NOT your IP address, so that, for instance, if you've exceeded your download limit at the local internet cafe, (or at work) or you've been banned, you can get back online (as generally, ADMINS block MAC addresses, not IPs) And yes, of course it disconnects you from the net, as it's changed your MAC address and you therfore need to reconnect with your NEW MAC address to remain 'icognito'! :-)Tuesday, November 03 2009 @ 06:19 PM PST
Why? - prolaw1
According to developer's site -Application to spoof your Ethernet or Airport mac address. It will also generate a random address for you. Admin password required to change mac addresses. Just copy to your applications folder to install.
Limitations
-only works for the primary ethernet address
-does not work with Mac Pro airport
Released under GPL. The scripts used to get and set the mac address, for both the Airport and Ethernet interfaces, were modified from one written by Fouad Sethna.
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Sunday, October 21 2007 @ 07:39 AM PDT