If you work as an independent contractor in these fields, you need Professional E&O insurance.
Application Design
Computer Security
Custom Software Development
Database Administration
Data Warehouse Consulting
Electronic Data Processing
ERP/CRM Consulting
Graphic Design
Hardware/Software Reselling
Helpdesk/Call Centers
Mainframe Consulting
Messaging Consulting
Network Administration
Network Services
Packaged Software Installation
Records Management/Retrieval
System Administration
Support Services
Technical Hardware Equipment Evaluation & Selection
Technical Project Management
Technical Staffing Services
Training & Education
Web Site Development & Design
And many more…