ZipRealty is an online real estate agency that's practically ancient in terms of Internet history. A survivor of the late 1990s dot-com bust, ZipRealty gives users home listings and values across more than 1 million homes. Home owners can also list their home right on the site, and have ZipRealty help sell it. The benefit to sellers is that there's usually a lower commission charge than they'd get from local real estate agencies.
The site also features a price-tracking tool to search homes with reduced prices, and a tool that tells you what your home should be worth based on its size, amenities, and the recent values of other homes in your area. It's not the flashiest site around, but clearly ZipRealty knows what it's doing having been around so long. Four tabs across the top take you into the main features of the site: Homes for Sale, Home Values, Find a Realtor, and Featured Homes. If you're planning to sell or purchase a home in the near future, it's a good place to start.