It's possible that there are Javascript/Java/ActiveX/whatever tricks to get the MAC address of a machine in code running in a browser and send it to a remote computer on the Internet, and thereby track visitors even if they use different browsers or turn off cookies or reinstall their operating system, or to figure out that the same person connects from Location A during the day, Location B at night, and Location C every so often on the weekend.
I don't know if there are great benefits to changing it, as typically the only devices that see it are other devices on your LAN. so you use the MAC address of his laptop to gain access to his WiFi - or your MAC address has been blocked, see Pages 6-7 of the Aaron Swartz indictment). (e.g., your neighbor has open WiFi, but limits it to certain MAC addresses. There are no legal issues re spoofing the MAC address, unless you're doing it to gain access to something you wouldn't otherwise have, or to impersonate someone else. This would've been my answer to that question: Someone asked about MAC address spoofing as a privacy technique, then deleted their post before I could reply.
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