From Lisa Girion's story on insurance underwriting (which I say more about at Tapped), here's a list of jobs which will lead major insurers in California to simply refuse to offer you coverage -- at any price:
Air traffic control
Building, moving
Chemical/rubber manufacturing
Circus or carnival work
Concrete or asphalt work
Crop dusting
Firefighting
Furniture and fixtures manufacturing
Lumber work, including wood chopping, timber cutting and working in a sawmill
Migrant labor
Oil well or refinery work
Police work
Roofing
Sandblasting
Sports, semi-pro or professional
Stockyard work, with or without butchering
Stables, all employees
Stunt work
Telecom installation
Transportation and aviation
Tree climbing
Tunnel work
War reporting
Window work at heights exceeding three stories
One wonders if making a living doing telecom installation, or roofing, or window cleaning, or lumber work, or construction is really so sinful that we think it acceptable for our health system to deny such workers health coverage.