How to avoid that feeling? Get specific about what you want and then go to a specific web site for it. Associations are a great place to start. While living in the D.C. area, I've learned that there are associations for every line of work. There's even an association for associations. One of my past gigs was editing a newsletter for wastewater treatment plant managers (a great bunch of folks, by the way--great senses of humor). Googling your profession of choice and "association" usually turns something up, and if you're not a member already, consider joining, or at least visiting their site regularly. Many have great job boards.
Also, go to the sites that job seekers recommend for your particular profession. The U.S. Department of Labor surveyed job seekers a year ago on their favorite online job sites, then compiled an extensive list. Monster.com your favorite? Many others rank higher with job seekers, according to the Department of Labor lists for general job sites.
Shopping for a job site should take a little work. Some people spend more time shopping for a refrigerator than the resources they will use to guide them in their life's work. Save yourself some frustration and create a list of sites that works for you.