It's important to have a system in place when you start a job search. Start by searching the top job sites, your local job sites, and the job sites that focus on your career field(s) of interest each and every day. New jobs are posted all the time so you need to stay on top of what's available so you can beat the crowd and get your application in early.
Job Search Agents
Create job search agents (all the top job sites have them) so you can have new postings emailed to you as soon as they are posted.
Add to Favorites
Bookmark the sites you visit on a regular basis and search them daily. These should include the top job sites: Monster, CareerBuilder (great for local listings) and Dice. If your local newspaper isn't affiliated with Career Builder check that site regularly too.
Expedite Your Job Search
Use the job search engines to expedite your job search. You'll be able to search the major job sites, company sites, associations and other online job sites in one simple step.
Expand Your Search
Don't forget the niche sites that focus on a specific industry or location. They can be a great source of listings. For example, one of my favorite local sites is our Chamber of Commerce Job Bank. Jobs are frequently posted there before they are advertised in the newspaper and I know more than a few people who have found a job from the postings listed there.