The one of the sister city of Cupertino, is Toyokawa city in Aichi Prefecture,Japan.
The headquarter of Apple Computer is located on Cupertino. If you found any Macintosh, look the behind (or bottom) of the machine. And also, Hewlett-Packard and Sun Microsystems and another famous companies have some divisions in Cupertino.
Link to interest points :
Cupertino : San Jose : San Francisco : Oakland : Santa Cruz : U.C. Berkeley : Stanford Univ.