Comment IC3 & MOS (Score 1) 629
I work for a company that has dedicated itself to answering this very question. The certifications are called MOS (Microsoft Office Certification) which is pretty well known, I think, and IC3 (Internet and Computing Core Certification) which is less well know, but gaining in popularity. There are already many school districts individually, and several states that require IC3 certification for graduation from High School. For details on the certification, how to get it, and what it covers, visit http://www.certiport.com/
Personally, I would never hire an employee in an office environment who COULDN'T be IC3 certified, and if they had the certification I would put their resume on the top of the pile.