Civil Only
CivilEngineeringJobs.Com - Identify jobs with the world's greatest companies, or find the most capable employees online.  CivilEngineeringJobs.Com accelerates results for job seekers and employers by serving civil engineers exclusively.
Carreers in Construction - British Jobs in Engineering and Construction.

General Job Boards
Monster.com - Open to all carreer paths.  One of the biggest job boards on the web. Search jobs, personalize your career tools, and find the employees you need.
America's Job Bank  - searchable database of job listings. Created through a partnership between the U.S. Department of Labor and the state operated public Employment Service.
CareerMosaic  - thousands of job postings and resumes, hundreds of companies, special sections for college students, industry specific sites, and more.
Career Magazine - comprehensive resource center featuring job openings, employer profiles, resumes, a forum, articles, and more.
CareerBuilder - job listings and career advice.
NationJob Network - promotes job openings in a variety of ways including personal job scout and customized e-mail service.
CareerWeb  - global recruitment center. One-stop-shop for learning about the top technical employers, browsing job opportunities, applying for jobs online and testing and polishing your "career fitness".
HeadHunter.net - post your resume or view job listings for free.
CareerCity - search the job database and submit your resume online. Also offers a career center, resume samples, and interview strategies.

Carreer Tools
Salary.com - Find out what you should be making - then show it too your boss!
Realtor.com - Need to relocate to a new job? This site not only provides detailed real estate listings but detailed information on communities all over the US.  An excellent resource for those relocating.
Official City Sites - You can check out the employment opportunities at your favorite city or just check salaries.