Real estate has become quite mobile and openly communicated via internet. The competition for this "business information" is robust and heavily financed - by stakeholders more so than local MLS's. The ever-changing R.E. climate is dictated by consumers and it looks like Trulia, Zillow, Realtor & others will have a hand in a significant amount of the real estate transactions in the future.
This might be an obvious answer, but I'm my clients are also supplementing their home search using Craigslist of all things. I also used to minimize the value of Realtor.com, but I've had some success with that site recently as well. But all this may be for naught once trulia and Zillow merge and become this juggernaut.
I am in the Kenosha area but get on the point2nls.com site if you haven't done so..My website is powered by point2nls.com and I am happy with the results. oodle.com, zillow.com,backpage.com,cyberhomes.com,hotpads.com