There is an OU job site, and a National Council of Young Israel mailing list, in addition to sites like Jewish Jobs.
For those in the sciences (mainly bio), check Science Careers and Nature Jobs. Also, for chemists, check the ACS site. For physicists check Physics Today Jobs. For electrical engineers check the IEEE site.
For those in Academia, check Chronicle of Higher Education. Many universities have their own careers site, and have many regular jobs, in addition to the academic (research and teaching) positions.
There are is also a Federal Gov’t job site, USAJOBS.
For those with specialized skills, try 6FigureJobs. These are in addition to the standard places like CareerBuilder, Monster, Dice, HotJobs, and Craigslist.