U.S. News & World Report ranked the top 50 careers for 2010.  Below is JobTitled links to the top careers in each category.

Science and Technology

• Software Engineer
• Systems Analyst
• Network Architect
• Biomedical Engineer
• Environmental Science Technician
• Hydrologist
• Environmental Engineering Technician
• Civil Engineer
• Meteorologist

Healthcare

• X-Ray Technician
• Veterinarian
• Lab Technician
• Physical Therapist
• Registered Nurse
• Physician Assistant
• Optometrist
• Physical Therapist Assistant
• Dental Hygienist
• School Psychologist

Education and Civic

• Firefighter
• Mediator
• Clergy
• Urban Planner
• Special-ed Teacher
• Court Reporter
• Medical and Public Health Social Worker
• Emergency Management Specialist
• Marriage and Family Therapist

Business and Finance

• Actuary
• Training Specialist
• Financial Advisor
• Financial Analyst
• Market Research Analyst
• Accountant
• Loan Officer
• Public Relations Specialist
• Cost Estimator
• Meeting Planner
• Logistician

Creative and Service

• Commercial Pilot
• Technical Writer
• Funeral Director
• Security System Installer
• Landscape Architect
• Plumber
• Film and Video Editor
• Multimedia Artist
• Gaming Manager
• Curator

This explains their methodology for creating the list:

For this year’s list, U.S. News examined the Labor Department’s brand-new job growth projections for 2008 to 2018. We looked for occupations that will add jobs at an above-average rate over the next decade or so and those that provide an above-average median income. We analyzed the data for jobs with enough bulk to make them worth mentioning. Since not everyone wants to be a nurse or an engineer, we looked for occupations in a broad range of categories. And since not everyone can go back to school for a doctorate, we included a broad range of educational requirements. We also considered, where possible, data on job satisfaction, turnover, and impending retirements,which crank up openings in jobs that may have only slightly above-average employment growth.