You have to take your car in for an oil change every 3 to 5,000 miles, this article from the NY Times advises job seekers to do the same on elements of your search.
One good paragraph:
“SUPPORT SYSTEMS Finally, recognize that looking for a job — especially in a market like this — can take a psychological toll. Don’t take it personally if your job hunt is taking a long time. Many excellent job candidates, victims of the economic downturn, are in the same boat now.
Even in the best of times, a job hunt is often about rejection — and that can be hard to endure. Staying in touch with family, friends, professional networks and fellow job seekers can help you maintain a positive attitude and a sense of perspective.”