From Syn Software:
MAC Change is a network utility for Windows that allows you to spoofing Mac Address of your network card. MAC Change also include a very useful database that contains all manufacturer of the card known as the Organisational Unique Identifier (OUI). The search functions allows you to find out related information through a pleasant graphical user interface. Trial version is valid for 30 days only and changes mac address to 0C:0C:0C:0C:0C:01 only.