Career Advice for Life Scientists
This site has several publications with career advice written by the American Society for Cell Biology. Articles can be downloaded as PDFs.

Faculty for the Future
Faculty for the Future aims to increase the participation of women and underrepresented minorities in science by matching students and postdocs with research positions (undergraduate and graduate research programs, as well as postdoctoral and faculty positions). Register and post your resume; potential employers can search for candidates.

PhDs.org
PhDs.org gives advice about graduate school, postdocs, and beyond for people studying science, math, and engineering.