Also worth having a look at some of the college websites that can offer very good career services.
Depending on what the job is its also worth searching directly off the company websites. A lot of jobs may never get advertised if the right person can apply directly to the company before it goes to print.
Making sure you have the right CV and Cover Letter, geared towards each individual job you apply for (don't use a single generic CV for every job) is probably the biggest part of your job search.