A good guess would be Boston or Seattle but the U.S. Census Bureau's annual American Community Survey (ACS) reveals a metropolitan area's "TQ" (technology quotient). In fact the honor of the second highest concentration of IT professionals is the Washington metro area.
The annual average salary for computer and information systems managers in Silicon Valley as of May 2006 was $139,460, according to the Bureau of Labor Statistics. In the D.C. metro area, that figure was $122,950.