Half of the electrical in my house went out today.  After searching for hours for a tripped GFCI, testing voltages in the breaker, and inspecting wiring I finally discovered that it was a tripped GFCI in the master bathroom.  The circuit this little bugger tripped included:

• Dining room outlets
• Dining room overhead light
• Kitchen overhead light
• Over-the-range microwave plug
• Outlets in the family room, including the entertainment center
• First floor hall lights
• Outlets in first floor hallway
• Basement stair lights
• Two outlets in the basement
• Overhead flourescents in the basement
• Fourth bedroom outlets (shares a wall with the master bath)
• ONE outlet in the master bath.  Not the GFCI on the left wall, just the GFCI on the right wall.  *hangs head in bewilderment*