Home values:  Click the link and start zooming in.  Click on the map and move it right or left, up or down.  You'll see some amazing data!  Please note that local realtors feel that the information provided on Zillow is often inaccurate, but it's still fun to look.

Homes:  REColorado has a good list of homes available in the Golden area.

Commercial property:  The City of Golden maintains a database of commercial property that is available for lease or purchase.

Downtown commercial property:  The Golden Urban Renewal Authority also maintains a list of available property, with a specific focus in the downtown area.