Apple Products Serial Number Info Site - USEFUL
We support all Apple products including computers, laptops, monitors, printers and batteries.
http://www.chipmunk.nl/klantenservice/applemodel.html
Heres what I get:
Model: Mxxxx PowerBook G4 HighDensity 1.67GHz
Bus speed: 167MHz
Screen size: 15 inch
Factory: W8 (Shanghai China)
Production year: 2006
Production week: 04 (January)
Production number: 285 (within this week)
PowerBook G4, Mac OS X (10.4.6)