Why? because you are depending on the same resume sources. The biggest job boards are also the most common resume sources!
You will have to go beyond the major Job Boards to be sucessful and you will have to be creative in your IT recruitment strategy. The following websites allow you Free Job Posting and Resume Search to find IT talent. The following Job Boards allow you Free Job Posting and Resume Search both and can add to your recruiting efforts.
According to compete.com estimate ITJobCafe.com attracts 16,114 uniques visitors per month.This is one of the oldest FREE job sites for IT Recruitment. ITJobCafe.com is a specialized portal that focuses exclusively on IT professionals. Here you can post upto 100 jobs FREE alog with a basic resume search. I have been using IT Job Cafe with good results.
These are 2 new Job Boards worth taking a look. They offer impressive features but since these are newly launched services; their resume banks are light at the moment. But worth giving a try as they are growing fast within the IT recruitment community and free job positing can get you good visibility on the internet.