How high are the salaries in Silicon Valley?

• Enter your job/employer/location on these salaries databases to get an idea:
• Payscale 
• Glassdoor

• Check the Median Household Income in the area of your future home: city-data.com

• For geeks moving within the US to the Silicon Valley, check out the cost of living comparison:
• CNN
• city-data.com (example for Palo Alto, scroll to the bottom)
  
• Update: The 25 Companies That Pay Interns The Most