For you newbies out there, every network interface card (NIC) has its own unique identifier called a MAC Address. How to find your MAC Address. A MAC Address is made up of 6 bytes. The first 3 bytes (6 characters) identifies the vendor. You may need to one day know what vendor made the card based on MAC Address. Of course, MAC Addresses can be spoofed, but the items below will come in handy anyway:

Vendor Lookup by xx:xx:xx:
http://standards.ieee.org/regauth/oui/index.shtml
http://coffer.com/mac_find/

Download the entire public OUI listing:
http://standards.ieee.org/regauth/oui/oui.txt

Don

PS - But how do I change / spoof MAC Addresses? Here's a little extra tidbit for you...