The BioCareer Center
http://www.biocareer.com/
(Biotechnology Industry Organization and SciWeb) is a resource for biotechnology careers that includes job and resume databases, career articles reprinted from sources such as CareerSource Magazine and Fast Company and a web resource directory. 

Bio Online
http://www.bio.com/
Provides industry news, company profiles and job postings. The Career Center features a very useful collection of over 50 articles on Your Career in the Sciences by David G. Jensen. The topics are relevant for both academia and industry and address such issues as the job hunt, how to improve your career skills and how to be a better manager. Bio Online also hosts an active, moderated Career Forum.
 
Biospace
http://www.biospace.com/career_main.cfm
Provides extensive coverage of breaking news releases, company profiles and financial results and includes job listings. BioSpace focuses on "hotbed communities" in the US, Canada and the UK; the site has a special section on start-up companies. 
 
The Chronicle of Higher Education
http://chronicle.com/
Presents daily news items and a collection of articles on current issues in education and academia. The Career Network has useful articles, career development advice and job listings.
 
Employment Links for the Biomedical Scientist
http://www.his.com/~graeme/employ.html
(Graeme Eisenhofer) is a comprehensive link collection that includes links for online job openings, employment resources, biotechnology resources and search firms.
 
HMS Beagle
http://news.bmn.com/hmsbeagle/
(BioMedNet) is an online biology webzine that covers current research news and online resources for biologists. The bi-weekly Careers column provides essays about career challenges in bioscience. Free access with registration. 
  
PhDs.Org: Science, Math, and Engineering Career Resources
http://www.phds.org/
Is full of great information for grad students, post-docs and younger students considering a career in science. The site includes information on how to choose and survive grad school, obtain internships and fellowships and find employment in the sciences. Note: this site had not been accessible recently! 
 
Science's Next Wave (AAAS)
http://www.nextwave.org/
Is a career development resource for young scientists. The Career Development Center for Postdocs and Junior Faculty provides over 70 articles that focus on professional issues in academia and grant writing information. Discussion forums are available, but are not very active. Access to additional material at Next Wave is limited to institutional and paying subscribers.
 
The Scientist 
http://www.the-scientist.com/
A bi-weekly science news journal that presents relevant articles pertaining to both traditional and alternative science careers in the Profession section of every issue. The site allows full access to archived articles.
 
theLabRat.com
http://www.thelabrat.com/jobs/
A refreshing site with job information in the biotechnology industry. The resource includes job postings, company profiles, biotech head hunters, career advice and message boards. 
  
Alternative Careers
Alternative Careers in Biosciences (Yale University)
Features a collection of lecture notes from a seminar series on alternative careers.   

Careers in Science and Engineering: A Student Planning Guide to Grad School and Beyond (NAS) 
http://www.nap.edu/readingroom/books/careers/
Includes sections on evaluating possible careers in science, choosing graduate schools and tips for finding a job. The guide profiles several scientists and their different career paths.