They have a lot more to offer other than list tours.

A good real estate web service consolidates buyers, sellers, agents and data in one place. Some of the filters that users can access include commute time, price history, flood zone hazard, and school district. They can program tours, check out the interest rates on mortgages, and keep track of the decrease in the value of the houses they've been saving for.

Nearly all homebuyers (96%) used some kind of online resource when looking for a house, said the National Association of Realtors. Combined, that was a hefty amount of money.